Patent Publication Number: US-2023135937-A1

Title: Wisdom ring puzzle

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of priority to Japanese Patent Application No. 2021-178353, filed on Oct. 29, 2021, the entire contents of which are incorporated herein by reference. 
     FIELD 
     An embodiment of the present invention relates to a wisdom ring puzzle. More specifically, an embodiment of the present invention relates to a wisdom ring puzzle having a three-dimensional structure including a pole and a ring member which can be enjoyed using a looped lace. 
     BACKGROUND 
     As represented by the Chinese ring, there is known a wisdom ring puzzle composed of a rod-shaped pole, a ring member arranged at a tip of the pole, and a looped lace. In recent years, a wisdom ring puzzle composed of a combination of a pole and a ring member using the Chinese ring as a prototype has been proposed (U.S. Pat. No. 6,112,956 and Japanese laid-open patent publication No. H2-283392). Further, U.S. Pat. No. 6,546,364 is proposed as a wisdom ring puzzle having a different structure from that of the Chinese ring. The wisdom ring puzzle according to U.S. Pat. No. 6,546,364 is a puzzle having a three-dimensional structure and uses a looped lace. 
     The wisdom ring puzzle described in U.S. Pat. No. 6,112,956 and Japanese laid-open patent publication No. H2-283392 is complicated to solve, but there are many repetitions of simple mechanical operations, so that there are few stimuli to the logical thinking and imagination of a player. Therefore, there is a problem in that the player cannot have a contiguous interest and motivation to create a solution for these wisdom ring puzzles. 
     SUMMARY 
     A wisdom ring puzzle according to an embodiment includes: a stage; a first ring unit positioned in a first direction with respect to the stage; a second ring unit positioned in the first direction with respect to the first ring unit; a first pole; and a second pole connected to the second ring unit and connected to the stage through the inner side of the first ring unit. The first pole is connected to the first ring unit, extends in the first direction from the first ring unit, turns and extends in a second direction opposite to the first direction, is connected to the stage passing through the inner side of the first ring unit, and passes through the inner side of the second ring unit at a side of the first direction of the first ring unit. 
     The second pole may extend toward the stage from an end portion of the second ring unit in the second direction. The second pole may be connected to the stage. 
     The wisdom ring puzzle may further include: a third ring unit positioned between the stage and the first ring unit; and a third pole connected to the third ring unit and connected to the stage. The first pole may be connected to the stage through the inner side of the third ring unit. 
     The stage may include a stage upper surface, the first pole, the second pole, and the third pole being connected to the stage upper surface. The first ring unit may be arranged on a first virtual plane. The second ring unit may be arranged on a second virtual plane. The third ring unit may be arranged on a third virtual plane. An angle formed by the stage upper surface and the first virtual plane may be smaller than an angle formed by the stage upper surface and the second virtual plane. An angle formed by the stage upper surface and the third virtual plane may be smaller than an angle formed by the stage upper surface and the second virtual plane. 
     The wisdom ring puzzle may further include: a third ring unit positioned in the first direction with respect to the first ring unit; a fourth ring unit positioned in the first direction with respect to the third ring unit; a third pole; and a fourth pole connected to the fourth ring unit and connected to the stage through the inner side of the third ring unit. The third pole may be connected to the third ring unit, may extend in the first direction from the third ring unit, may turn and extend in the second direction, and may pass through the inner side of the third ring unit and the inner side of the first ring unit. The first pole may pass through the inner side of the second ring unit. The third pole may pass through inner side of the fourth ring unit. 
     The stage may include a stage upper surface, the first pole, the second pole, and the third pole being connected to the stage upper surface. The first ring unit may be arranged on a first virtual plane. The second ring unit may be arranged on a second virtual plane. The third ring unit may be arranged on a third virtual plane. The fourth ring unit may be arranged on a fourth virtual plane. An angle formed by the stage upper surface and the first virtual plane may be smaller than an angle formed by the stage upper surface and the second virtual plane. An angle formed by the stage upper surface and the third virtual plane may be smaller than an angle formed by the stage upper surface and the second virtual plane. An angle formed by the stage upper surface and the first virtual plane may be smaller than an angle formed by the stage upper surface and the fourth virtual plane. An angle formed by the stage upper surface and the third virtual plane may be smaller than an angle formed by the stage upper surface and the fourth virtual plane. 
     The wisdom ring puzzle may further include: a third ring unit positioned in the first direction with respect to the first ring unit; a fourth ring unit positioned in the first direction with respect to the third ring unit; a third pole; and a fourth pole. The third pole may be connected to the third ring unit, may extend in the first direction from the third ring unit, may turn and extend in the second direction, and may pass through the inner side of the third ring unit. The fourth pole may be connected to the fourth ring unit, may extend in the first direction from the fourth ring unit, may turn and extend in the second direction, and may be connected to the stage through the inner side of the third ring unit and the inner side of the first ring unit. The first pole may pass through the inner side of the second ring unit. The third pole may pass through the inner side of the fourth ring unit. 
     The stage may include a stage upper surface, the first pole, the second pole, and the third pole being connected to the stage upper surface. The first ring unit may be arranged on a first virtual plane. The second ring unit may be arranged on a second virtual plane. The third ring unit may be arranged on a third virtual plane. The fourth ring unit may be arranged on a fourth virtual plane. An angle formed by the stage upper surface and the first virtual plane may be smaller than an angle formed by the stage upper surface and the second virtual plane. An angle formed by the stage upper surface and the third virtual plane may be smaller than an angle formed by the stage upper surface and the second virtual plane. An angle formed by the stage upper surface and the first virtual plane may be smaller than an angle formed by the stage upper surface and the fourth virtual plane. An angle formed by the stage upper surface and the third virtual plane may be smaller than an angle formed by the stage upper surface and the fourth virtual plane. 
     The second pole may extend in the first direction from an end portion of the second ring unit in the first direction, may turn and extend in the second direction, and may be connected to the stage through the inner side of the first ring unit. 
     The wisdom ring puzzle may further include: a third ring unit positioned between the stage and the first ring unit; and a third pole connected to the third ring unit and connected to the stage. The second pole may be connected to the stage through the inner side of the third ring unit. 
     The stage may include a stage upper surface, the first pole, the second pole, and the third pole being connected to the stage upper surface. The first ring unit may be arranged on a first virtual plane. The second ring unit may be arranged on a second virtual plane. The third ring unit may be arranged on a third virtual plane. An angle formed by the stage upper surface and the first virtual plane may be smaller than an angle formed by the stage upper surface and the second virtual plane. An angle formed by the stage upper surface and the third virtual plane may be smaller than an angle formed by the stage upper surface and the second virtual plane. 
     A wisdom ring puzzle according to an embodiment includes: a stage; a first ring unit positioned in a first direction with respect to the stage; a second ring unit positioned in the first direction with respect to the first ring unit; a first pole; a second pole; and a third pole. The first pole is connected to the first ring unit, extends in the first direction from the first ring unit, turns and extends in a second direction opposite to the first direction, is connected to the stage, and passes through the inner side of the second ring unit. The second pole is connected to the second ring unit, extends in the first direction from the second ring unit, turns and extends in the second direction, and is connected to the stage. The third pole is connected to the stage, extends in the first direction from the stage, turns and extends in the second direction, and passes through the inner side of the first ring unit. A gap is provided between an end portion of a part of the third pole in the second direction and the stage. The part extends in the second direction. 
     A position where the first pole is connected to the stage may be arranged between a position where the second pole is connected to the stage and the second ring unit in a plan view. The second ring unit may be arranged between a position where the first pole is connected to the stage and the first ring unit in a plan view. 
     The first ring unit may be arranged between a position where the second pole is connected to the stage and the second ring unit in a plan view. The second ring unit may be arranged between a position where the first pole is connected to the stage and the first ring unit in a plan view. 
     A wisdom ring puzzle according to an embodiment includes: a stage; a first ring unit positioned in a first direction with respect to the stage; a second ring unit positioned in the first direction with respect to the first ring unit; a first pole; a second pole; and a third pole. The first pole is connected to the first ring unit, extends in the first direction from the first ring unit, turns and extends in a second direction opposite to the first direction, is connected to the stage crossing over the outer side of the first ring unit, and passes through the inner side of the second ring unit at a side of the first direction of the first ring unit. The second pole is connected to the second ring unit, extends in the first direction from the second ring unit, turns and extends in the second direction, and is connected to the stage. The third pole is connected to the stage, extends in the first direction from the stage, turns and extends in the second direction, and passes through the inner side of the first ring unit. A gap is provided between an end portion of a part of the third pole in the second direction and the stage, the part extending in the second direction. 
     A position where the first pole is connected to the stage may be arranged between a position where the second pole is connected to the stage and the second ring unit in a plan view. The second ring unit may be arranged between a position where the first ring unit is connected to the first pole and a position where the first pole is connected to the stage in a plan view. 
     A position where the first ring unit is connected to the first pole may be arranged between a position where the second pole is connected to the stage and the second ring unit in a plan view. The second ring unit may be arranged between a position where the first ring unit is connected to the first pole and a position where the first pole is connected to the stage in a plan view. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1 A  is a diagram showing a structure of a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  1 B  is a diagram showing a structure of a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  2    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  3    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  4    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  5    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  6 A  is a diagram showing a structure of a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  6 B  is a diagram showing a structure of a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  7    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  8    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  9 A  is a diagram showing a structure of a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  9 B  is a diagram showing a structure of a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  10    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  11    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  12    is a diagram showing a structure of a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  13    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  14    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  15    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  16    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  17    is a diagram showing a structure of a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  18    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  19    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  20    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  21    is a diagram showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  22 A  is a diagram showing a structure of a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  22 B  is a diagram showing a structure of a wisdom ring puzzle according to an embodiment of the present invention. 
         FIG.  23    is a diagram showing a structure of a wisdom ring puzzle in a comparative example. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, a wisdom ring puzzle according to the present embodiment will be described in detail with reference to the drawings. In the following description, elements having substantially the same functions and configurations are denoted by the same symbols and will be described redundantly only when necessary. The following embodiments exemplifies a device and method for embodying the technical idea of this embodiment. The technical idea of the embodiment is not to specify the material, shape, structure, arrangement, or the like of the constituent parts as follows. Various modifications may be made to the technical idea of the embodiment in addition to the scope of the claims. 
     In each embodiment of the present invention, direction from a stage  100  toward each structure body (e.g., a first structure body  200 ) is referred to as upper direction or first direction. On the contrary, direction from each structure toward the stage  100  is referred to as lower direction or second direction. As described above, for convenience of explanation, although the phrase “upper” or “lower” is used for explanation, for example, the stage  100  and the first structure body  200  may be arranged so that the vertical relationshipship is opposite to the drawing. In the following description, for example, the expression “the first structure body  200  above the stage  100 ” merely describes the vertical relationshipship between the stage  100  and the first structure body  200  as described above, and other members may be arranged between the stage  100  and the first structure body  200 . The upper direction or lower direction means the vertical relationshipship in a vertical direction in the plurality of members, and the expression “the first structure body  200  above the stage  100 ” indicates the positional relationshipship in which the stage  100  and the first structure body  200  do not overlap in a plan view. On the other hand, the expression “the first structure body  200  vertically above the stage  100 ” indicates the positional relationshipship in which the stage  100  and the first structure body  200  overlap in a plan view. 
     In the present specification, expressions “a includes A, B, or C,” “a includes any of A, B, and C,” and “a includes one selected from a group consisting of A, B, and C,” do not exclude the case where a includes a plurality of combinations of A to C unless otherwise specified. Furthermore, these expressions do not exclude the case where a includes other elements. 
     An object of an embodiment of the present invention is to provide a wisdom ring puzzle capable of sustaining the interest and motivation of a player to create a solution. 
     1. First Embodiment 
     Wisdom ring puzzles  10  and  10 A according to a first embodiment of the present invention will be described with reference to  FIG.  1 A  to  FIG.  5   .  FIG.  1 A  and  FIG.  1 B  are diagrams illustrating structures of wisdom ring puzzles according to embodiments of the present invention.  FIG.  2    to  FIG.  5    are diagrams showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. As will be described later, the wisdom ring puzzles  10  and  10 A are puzzles using laces  20  and  20 A. The player enjoys the wisdom ring puzzles  10  and  10 A by entangling the laces  20  and  20 A with poles (for example, third poles  420  and  420 A) arranged on the wisdom ring puzzles  10  and  10 A or removing the laces  20  and  20 A from the poles. 
     [1-1. Structure of Wisdom Ring Puzzle  10 ] 
     As shown in  FIG.  1 A , the wisdom ring puzzle  10  includes the stage  100 , the first structure body  200 , a second structure body  300 , and a third structure body  400 . The lace  20  is used to play with the wisdom ring puzzle  10 . In the present embodiment, although the lace  20  has a closed loop shape, it is not limited to this configuration. 
     The stage  100  includes an upper surface  101  and a bottom surface  103 . The first structure body  200 , the second structure body  300 , and the third structure body  400  are connected to the upper surface  101 . The bottom surface  103  is a surface that can be placed on a flat surface such as a table. In the present embodiment, the stage  100  has a circular flat plate shape in a plan view. However, the shape of the stage  100  in a plan view is not limited to a circular shape. For example, the shape of the stage  100  in a plan view may be a polygon such as a triangle or a quadrangle or may be an ellipse or a looped curved shape. In addition, the upper surface  101  and the bottom surface  103  are not limited to a flat surface and may be a structure in which unevenness is arranged. 
     The first structure body  200  includes a first ring unit  210  and a first pole  220 . The first ring unit  210  is arranged on a virtual plane substantially parallel to the upper surface  101 . The first pole  220  is connected to the first ring unit  210  and has an upwardly convex U-shape. In other words, the first pole  220  is connected to the first ring unit  210 , extends in direction D 1  from a connection part with the first ring unit  210 , is turned, and extends in direction D 2 . The first pole  220  extending in the direction D 2  passes through the inner side of the first ring unit  210  and reaches the stage  100 . The first pole  220  is connected to the first ring unit  210  at an end portion of the first ring unit  210  in direction D 4  in a plan view. In a plan view, the first pole  220  extends in direction D 3  from the connection part with the first ring unit  210  and reaches the stage  100  at the inner side of the first ring unit  210 . However, a position where the first pole  220  is connected to the first ring unit  210  is not limited to the above-described configuration. 
     The second structure body  300  includes a second ring unit  310  and a second pole  320 . The second ring unit  310  is arranged on a virtual plane substantially orthogonal to the upper surface  101 . The second pole  320  extends from an end portion of the second ring unit  310  in the direction D 2  toward the stage  100  and is connected to the stage  100 . However, a position where the second pole  320  is connected to the second ring unit  310  is not limited to the above-described configuration. 
     The third structure body  400  includes a third ring unit  410  and the third pole  420 . The third ring unit  410  is arranged on a virtual plane substantially parallel to the upper surface  101 . The third pole  420  is connected to the third ring unit  410  at an end portion of the third ring unit  410  in the direction D 3 . The third pole  420  extends from a connection part with the third ring unit  410  toward the direction D 2  and is connected to the stage  100 . However, a position where the third pole  420  is connected to the third ring unit  410  is not limited to the above-described configuration. 
     The first ring unit  210  is positioned in the direction D 1  with respect to the stage  100 . The second ring unit  310  is positioned in the direction D 1  with respect to the first ring unit  210 . The third ring unit  410  is positioned in the direction D 1  with respect to the stage  100  and the direction D 2  with respect to the first ring unit  210 . As described above, in the present embodiment, the virtual plane (first virtual plane) on which the first ring unit  210  is arranged and the virtual plane (third virtual plane) on which the third ring unit  410  is arranged are substantially parallel to the upper surface  101 , and the virtual plane (second virtual plane) on which the second ring unit  310  is arranged is substantially orthogonal to the upper surface  101 . However, the present invention is not limited to the above configuration. For example, the angle formed by the upper surface  101  and the first virtual plane and the angle formed by the upper surface  101  and the third virtual plane may be smaller than the angle formed between the upper surface  101  and the second virtual plane. 
     In the present embodiment, although the configuration in which all of the second ring units  310  are positioned in the direction D 1  with respect to the first ring unit  210  is exemplified, the configuration is not limited to this configuration. For example, a part of the second ring unit  310  may be positioned in the direction D 1  with respect to the first ring unit  210 . That is, when viewed from the side, the first ring unit  210  and the second ring unit  310  may intersect. 
     The first pole  220  extends in the direction D 1  from the connection part with the first ring unit  210 , passes through the inner side of the second ring unit  310 , and then passes through the inner side of the first ring unit  210  in the direction D 2 . Further, the first pole  220  passes through the inner side of the first ring unit  210  in the direction D 2 , passes through the inner side of the third ring unit  410 , and is connected to the stage  100 . In a plan view, the first pole  220  extends from the connection part with the first ring unit  210  toward the third pole  420  (the direction D 3 ), passes through the inner side of the second ring unit  310 , and is connected to the stage  100  at a position where the first ring unit  210  and the third ring unit  410  overlap. The second pole  320  extends from the second ring unit  310  in the direction D 2 , passes through the inner side of the first ring unit  210 , and is connected to the stage  100 . The third pole  420  extends from the third ring unit  410  in the direction D 2  and is connected to the stage  100 . 
     In the present embodiment, the first ring unit  210 , the second ring unit  310 , and the third ring unit  410  are contiguous with the first pole  220 , the second pole  320 , and the third pole  420 , respectively. For example, the first ring unit  210  is formed such that the first pole  220  is bent and forms a ring shape on the first virtual plane. Therefore, in the wisdom ring puzzle  10  of the present embodiment, each ring unit is not a completely closed loop shape without a gap but may be a closed loop shape without a gap. Also, even when a gap is arranged in each ring unit in the present embodiment, a width of the gap is such that the lace  20  does not pass therethrough. In addition, in the present embodiment, the first ring unit  210  and the first pole  220  are contiguous rod-shaped members. Similarly, the second ring unit  310  and the second pole  320  are contiguous rod-shaped members. Similarly, the third ring unit  410  and the third pole  420  are contiguous rod-shaped members. However, the ring unit and the pole may be separate members, and they may be joined to each other by welding or the like. 
     [1-2. Structure of Wisdom Ring Puzzle  10 A] 
     As shown in  FIG.  1 B , a wisdom ring puzzle  10 A includes a stage  100 A, a first structure body  200 A, a second structure body  300 A, and a third structure body  400 A. Although the wisdom ring puzzle  10 A shown in  FIG.  1 B  is similar to the wisdom ring puzzle  10  shown in  FIG.  1 A , the first structure body  200 A and the second structure body  300 A are different from the first structure body  200  and the second structure body  300  of the wisdom ring puzzle  10 . In the following description, differences between the wisdom ring puzzle  10  and the wisdom ring puzzle  10 A will be mainly explained. In the following description, in the case of describing the same configuration as the wisdom ring puzzle  10 , the description may be omitted by adding the letter “A” after the symbols shown in  FIG.  1 A . 
     A second pole  320 A extends in the direction D 1  from an end portion of the second ring unit  310 A in the direction D 1 , turns and extends in the direction D 2 . The second pole  320 A extending in the direction D 2  passes through the inner side of each of a first ring unit  210 A and a third ring unit  410 A and reaches the stage  100 A. In a plan view, the second pole  320 A extends from a connection part with the second ring unit  310 A toward a third pole  420 A (the direction D 3 ) and is connected to the stage  100 A at a position crossing over a first pole  220 A and at a position where the first ring unit  210 A and the third ring unit  410 A overlap. 
     Although the second ring unit  310  is positioned at the uppermost portion in the wisdom ring puzzle  10  shown in  FIG.  1 A , the second pole  320 A is positioned at the uppermost portion in the wisdom ring puzzle  10 A shown in  FIG.  1 B . Further, the wisdom ring puzzle  10  is different from the wisdom ring puzzle  10 A in that the first pole  220  passes through each of the inner sides of the first ring unit  210  and the third ring unit  410  in the wisdom ring puzzle  10  while the second pole  320 A passes through each of the inner sides of the first ring unit  210 A and the third ring unit  410 A in the wisdom ring puzzle  10 A. 
     In  FIG.  1 A  and  FIG.  1 B , although the configuration in which the first poles  220  and  220 A pass through the inner side of the second ring units  31  and  310 A in the vicinity of the uppermost portion of the first poles  220  and  220 A is exemplified, the configuration is not limited to this. The first poles  220  and  210 A may pass through the inner side of the second ring units  310  and  310 A from a connection part between the first ring units  210  and  210 A and the first poles  220  and  220 A to the position where the first poles  220  and  220 A pass through the inner side of the first ring units  210  and  210 A in the direction D 2 . Therefore, for example, the second virtual plane on which the second ring units  310  and  310 A are arranged may be parallel to the first virtual plane on which the first ring units  210  and  210 A are arranged. 
     [1-3. Method of Solving Wisdom Ring Puzzle  10  (Part 1)] 
     A method  1000  of solving the wisdom ring puzzle  10  shown in  FIG.  1 A  will be described with reference to  FIG.  2   . The lace  20  is used to play the wisdom ring puzzle  10 . The player moves the lace  20  along the poles (the first pole  220  to the third pole  420 ) arranged on the first structure body  200  to the third structure body  400  and moves the lace  20  between the poles by passing it through the inner side of the ring units (the first ring unit  210  to the third ring unit  410 ) or crossing it over the outer side of the ring units. Then, in the present embodiment, the player aims for a state in which the lace  20  is entangled only with the third pole  420 . That is, the wisdom ring puzzle  10  according to the present embodiment is a puzzle that aims at a state in which only the third pole  420  exists at the inner side of the lace  20 . 
     As shown in (A) of  FIG.  2   , a tip  21  of the lace  20  passes through the inner side of the first ring unit  210  in the direction D 1  (1) and passes through the inner side of the second ring unit  310  in the direction D 4  (2). In this case, the tip  21  moves along the first pole  220  and passes through the second ring unit  310  at the area in the direction D 1  with respect to the first pole  220 . In this state, the lace  20  does not pass through the inner side of the third ring unit  410 . The lace  20  which passed through the inner side of the second ring unit  310  sandwiches the first pole  220 . 
     As shown in (B) of  FIG.  2   , the tip  21  of the lace  20  moves upward along the first pole  220 , crosses over the second ring unit  310  in the direction D 3  (3), moves along the first pole  220  in the direction D 2  (4), and passes through the inner side of the first ring unit  210  in the direction D 2  (5). 
     As shown in (C) of  FIG.  2   , the tip  21  of the lace  20  crosses over the outer side (direction D 3  side) of the first ring unit  210  in the direction D 1  (6) and crosses over the second ring unit  310  in the direction D 4  (7). That is, the lace  20  hangs on the inner side of the second ring unit  310  and hangs down in the direction D 2 . In this state, the lace  20  sandwiches the first pole  220 . Also, the tip  21  of the lace  20  may pass through the inner side of the first ring unit  210 . This is the difference between the state shown in (A) of  FIG.  2    and the state shown in (C) of  FIG.  2   . 
     As shown in (D) of  FIG.  2   , the tip  21  of the lace  20  passes through the inner side of the second ring unit  310  in the direction D 3  (8), passes through the inner side of the first ring unit  210  in the direction D 2  (9), moves in the direction D 2  along the first pole  220 , and crosses over the outer side (direction D 4  side) of the third ring unit  410  in the direction D 2 . As a result, the lace  20  is in a state of being entangled with the first pole  220  and the third pole  420 . In this state, the first pole  220  and the third pole  420  exist on the inner side of the lace  20 . 
     As shown in (E) of  FIG.  2   , the tip  21  of the lace  20  passes through the inner side of the third ring unit  410  in the direction D 1  (10), passes through the inner side of the first ring unit  210  in the direction D 1  (11), and passes through the inner side of the second ring unit  310  in the direction D 4  (12). That is, the lace  20  hangs on the inner side of the second ring unit  310  and hangs down in the direction D 2  so as to pass through the inner side of the first ring unit  210 . In this state, the lace  20  sandwiches the first pole  220  and the third pole  420 . A point that the lace  20  passes through the inner side of the third ring unit  410  is a difference between the state shown in (C) of  FIG.  2    and the state shown in (E) of  FIG.  2   . 
     As shown in (F) of  FIG.  2   , from a state in which the tip  21  of the lace  20  passes through the inner side of the first ring unit  210  in the direction D 2 , while maintaining a state in which the lace  20  sandwiches the first ring unit  210 , the tip  21  moves in the direction D 1 , crosses over the outer side (direction D 4  side) of the first ring unit  210  in the direction D 1  (13), moves in the direction D 1  along the first pole  220 , crosses over the second ring unit  310  in the direction D 3  (14), moves in the direction D 2  along the first pole  220  (15), and crosses over the outer side (direction D 3  side) of the first ring unit  210  in the direction D 2  (16). 
     As shown in (G) of  FIG.  2   , the tip  21  of the lace  20  passes through the inner side of the first ring unit  210  in the direction D 1  (17) and crosses over the second ring unit  310  in the direction D 4  (18). The lace  20  crosses over the second ring unit  310  and sandwiches the first pole  220 . The tip  21  is positioned further in the direction D 4  with respect to the first pole  220  than the connection part between the first pole  220  and the first ring unit  210 . This is the difference between the state shown in (E) of  FIG.  2    and the state shown in (G) of  FIG.  2   . 
     As shown in (H) of  FIG.  2   , the tip  21  of the lace  20  passes through the inner side of the second ring unit  310  in the direction D 3  (19), passes through the inner side of the first ring unit  210  in the direction D 2  (20), and passes through the inner side of the third ring unit  410  in the direction D 2  (21). As a result, the lace  20  is in a state of being entangled only with the third pole  420 . In this state, only the third pole  420  exists at the inner side of the lace  20 . That is, this state is a state in which the puzzle is solved. 
     [1-4. Method of Solving Wisdom Ring Puzzle  10  (Part 2)] 
     Another method  1000  of solving the wisdom ring puzzle  10  shown in  FIG.  1 A  will be described with reference to  FIG.  3   . As shown in (A) of  FIG.  3   , the tip  21  of the lace  20  passes through the inner side of the third ring unit  410  in the direction D 1  (1), passes through the inner side of the first ring unit  210  in the direction D 1  (2), and passes through the inner side of the second ring unit  310  in the direction D 4  (3). In this case, the tip  21  moves along the first pole  220  and passes through the second ring unit  310  at the area in the direction D 1  with respect to the first pole  220 . In this state, the lace  20  which passed through the inner side of the second ring unit  310  sandwiches the first pole  220 . 
     As shown in (B) of  FIG.  3   , the tip  21  of the lace  20  moves in the direction D 1  along the first pole  220 , crosses over the second ring unit  310  in the direction D 3  (4), moves in the direction D 2  along the first pole  220  (5), and passes through the inner side of the first ring unit  210  in the direction D 2  (6). 
     As shown in (C) of  FIG.  3   , the tip  21  of the lace  20  crosses over the outer side (direction D 3  side) of the first ring unit  210  in the direction D 1  (7), and crosses over the second ring unit  310  in the direction D 4  (8). That is, the lace  20  hangs on the inner side of the second ring unit  310  and hangs down in the direction D 2 . In this state, the lace  20  sandwiches the first pole  220 . Also, the tip  21  of the lace  20  may pass through the inner side of the first ring unit  210 . This is the difference between the state shown in (A) of  FIG.  3    and the state shown in (C) of  FIG.  3   . 
     As shown in (D) of  FIG.  3   , the tip  21  of the lace  20  passes through the inner side of the second ring unit  310  in the direction D 3  (9), passes through the inner side of the first ring unit  210  in the direction D 2  (10), moves along the first pole  220  in the direction D 2 , and passes through the inner side of the third ring unit  410  in the direction D 2  (11). As a result, the lace  20  is in a state of being entangled only with the first pole  220 . In this state, only the first pole  220  exists at the inner side of the lace  20 . 
     As shown in (E) of  FIG.  3   , the tip  21  of the lace  20  passes through the inner side of the first ring unit  210  in the direction D 1  (12) and passes through the inner side of the second ring unit  310  in the direction D 4  (13). In this case, the tip  21  passes through the first ring unit  210  at the area in the direction D 4  with respect to the first pole  220 . That is, the lace  20  hangs on the inner side of the second ring unit  310  and hangs down in the direction D 2  so as to pass through the inner side of the first ring unit  210 . In this state, the lace  20  sandwiches the first pole  220  at the side of the direction D 2  of the third ring unit  410 . In this state, a point that the lace  20  crosses over the outer side of the third ring unit  410  (does not pass through the inner side of the third ring unit  410 ) is a difference between the state shown in (C) of  FIG.  3    and the state shown in (E) of  FIG.  3   . 
     As shown in (F) of  FIG.  3   , the tip  21  of the lace  20  crosses over the outer side (direction D 2  side) of the first ring unit  210  in the direction D 1  while maintaining a state in which the lace  20  sandwiches the first ring unit  210  (14), moves in the direction D 1  along the first pole  220 , crosses over the second ring unit  310  in the direction D 3  (15), moves in the direction D 2  along the first pole  220  (16), and crosses over the outer side (direction D 3  side) of the first ring unit  210  in the direction D 2  (17). 
     As shown in (G) of  FIG.  3   , the tip  21  of the lace  20  passes through the inner side of the first ring unit  210  in the direction D 1  (18), and crosses over the second ring unit  310  in the direction D 4  (19). The lace  20  which crossed over the second ring unit  310  sandwiches the first pole  220 . The tip  21  is positioned further in the direction D 4  with respect to the first pole  220  than the connection part between the first pole  220  and the first ring unit  210 . This is the difference between the state shown in (E) of  FIG.  3    and the state shown in (G) of  FIG.  3   . 
     As shown in (H) of  FIG.  3   , the tip  21  of the lace  20  passes through the inner side of the second ring unit  310  in the direction D 3  (20), passes through the inner side of the first ring unit  210  in the direction D 2  (21), and the lace  20  is reversed in the direction D 3  to be entangled only with the third pole  420  (a state in which the puzzle is solved). In this state, only the third pole  420  exists at the inner side of the lace  20 . 
     [1-5. Method of Solving Wisdom Ring Puzzle  10 A (Part 1)] 
     A method  1000 A of solving the wisdom ring puzzle  10 A shown in  FIG.  1 B  will be described with reference to  FIG.  4   . The wisdom ring puzzle  10 A is a puzzle targeting a state in which a lace  20 A is entangled only with the third pole  420 A (a state in which only the third pole  420 A exists at the inner side of the lace  20 A) similar to the wisdom ring puzzle  10 . 
     First, the lace  20 A is arranged so that the first structure body  200 A to a third structure body  400 A are all positioned at the inner side of the lace  20 A. That is, in a state where the lace  20 A is placed on the stage  100 A, the first pole  220 A to the third pole  420 A are sandwiched (surrounded) by the lace  20 A. From that state, as shown in (A) of  FIG.  4   , a tip  21 A of the lace  20 A passes through the inner side of the first ring unit  210 A in the direction D 1  (1), passes through the inner side of the second ring unit  310 A in the direction D 4  (2), and passes through the inner side of the first ring unit  210 A in the direction D 2  (3). In this case, the tip  21 A passes through the first ring unit  210 A at the area in the direction D 4  with respect to the first pole  220 A and passes through the second ring unit  310 A at the area in the direction D 2  with respect to the first pole  220 A. 
     As shown in (B) of  FIG.  4   , the tip  21 A of the lace  20 A extending in the side of the direction D 2  of the first ring unit  210 A crosses over the outer side (direction D 4  side) of the first ring unit in the direction D 1  (4), moves in the direction D 1  along the first pole  220 A and the second pole  320 A, and crosses over the uppermost portion of the second pole  320 A in the direction D 3  (5). Thereafter, the tip  21 A moves in the direction D 2  along the second pole  320 A and crosses over the outer side (direction D 3  side) of the first ring unit  210 A in the direction D 2  (6). In this state, the lace  20 A in the vicinity of the tip  21 A sandwiches the first pole  220 A and the second pole  320 A and is positioned at the outer side of the first ring unit  210 A. 
     As shown in (C) of  FIG.  4   , the tip  21 A of the lace  20 A passes through the inner side of the first ring unit  210 A in the direction D 1  (7), crosses over the uppermost portion of the second pole  320 A in the direction D 4  (8), moves in the direction D 2  along the second pole  320 A and the first pole  220 A, and crosses over the outer side (direction D 4  side) of the first ring unit  210 A in the direction D 2  (9). In this state, the lace  20 A in the vicinity of the tip  21 A sandwiches the first pole  220 A and the second pole  320 A and is positioned at the outer side of the first ring unit  210 A. 
     As shown in (D) of  FIG.  4   , the tip  21 A of the lace  20 A passes through the inner side of the second ring unit  310 A in the direction D 3  (10) and passes through the inner side of the first ring unit  210 A in the direction D 2  (11). As a result, the lace  20 A is in a state of being entangled with the second pole  320 A and the third pole  420 A. In this state, the second pole  320 A and the third pole  420 A exist on the inner side of the lace  20 A. 
     As shown in (E) of  FIG.  4   , the tip  21 A of the lace  20 A passes through the inner side of the third ring unit  410 A in the direction D 1  (12), passes through the inner side of the first ring unit  210 A in the direction D 1  (13), and passes through the inner side of the second ring unit  310 A in the direction D 4  (14). That is, the lace  20 A hangs on the inner side of the second ring unit  310 A and hangs down in the direction D 2 . In this state, the lace  20 A sandwiches the first pole  220 A, the second pole  320 A, and the third pole  420 A. As in (C) of  FIG.  4   , the lace  20 A in the vicinity of the tip  21 A is positioned at the outer side of the first ring unit  210 A. In this state, a point that the lace  20 A passes through the inner side of the third ring unit  410 A is a difference between the state shown in (C) of  FIG.  4    and the state shown in (E) of  FIG.  4   . 
     As shown in (F) of  FIG.  4   , the tip  21 A of the lace  20 A moves in the direction D 1  along the first pole  220 A and the second pole  320 A and crosses over the uppermost portion of the second pole  320 A in the direction D 3  (15). Thereafter, the tip  21 A moves in the direction D 2  along the second pole  320 A (16). 
     As shown in (G) of  FIG.  4   , the tip  21 A of the lace  20 A passes through the inner side of the first ring unit  210 A (an area between the first ring unit  210 A and the second pole  320 A) in the direction D 2  (17), turns and crosses over the outer side (direction D 3  side) of the first ring unit  210 A in the direction D 1  (17). The tip  21 A moves in the direction D 1  along the second pole  320 A, crosses over the uppermost portion of the second pole  320 A in the direction D 4  (18), moves in the direction D 2  along the second pole  320 A and the first pole  220 A, and passes through the inner side of the first ring unit  210 A in the direction D 2  (19). That is, the lace  20 A hangs on the inner side of the second ring unit  310 A and hangs down in the direction D 2  so as to pass through the inner side of the first ring unit  210 A. In this state, the lace  20 A sandwiches the first pole  220 A, the second pole  320 A, and the third pole  420 A. In this state, a point that the lace  20 A passes through the inner side of the first ring unit  210 A is a difference between the state shown in (E) of  FIG.  4    and the state shown in (G) of  FIG.  4   . 
     As shown in (H) of  FIG.  4   , the tip  21 A of the lace  20 A passes through the inner side of the first ring unit  210 A in the direction D 1  (20), moves in the direction D 1  along the first pole  220 A, passes through the second ring unit  310 A in the direction D 3  (21), moves in the direction D 2  along the first pole  220 A, and passes through the inner side of the first ring unit  210 A in the direction D 2  (22). Thereafter, the tip  21 A crosses over the outer side (direction D 4  side) of the first ring unit  210 A in the direction D 1  (23), moves in the direction D 1  along the first pole  220 A and the second pole  320 A, and crosses over the uppermost portion of the second pole  320 A in the direction D 3  (24), moves in the direction D 2  along the second pole  320 A, and crosses over the outer side (direction D 3  side) of the first ring unit  210 A in the direction D 2  (25), so that the lace  20 A is in a state of being entangled only with the third pole  420 A (a state in which the puzzle is solved). In this state, only the third pole  420 A exists at the inner side of the lace  20 A. 
     [1-6. Method of Solving Wisdom Ring Puzzle  10 A (Part 2)] 
     Another method  1000 A of solving the wisdom ring puzzle  10  shown in  FIG.  1 B  will be described with reference to  FIG.  5   . As shown in (A) of  FIG.  5   , the tip  21 A of the lace  20 A passes through the inner side of the third ring unit  410 A in the direction D 1  (1), passes through the inner side of the first ring unit  210 A in the direction D 1  (2), and passes through the inner side of the second ring unit  310 A in the direction D 4  (3). In this state, the lace  20 A which passed through the inner side of the second ring unit  310 A sandwiches the first pole  220 A. 
     As shown in (B) of  FIG.  5   , the tip  21 A of the lace  20 A moves in the direction D 4  with respect to the first ring unit  210 A in the direction D 1  along the first pole  220 A and the second pole  320 A (4), crosses over the uppermost portion of the second pole  320 A in the direction D 3  (5), moves in the direction D 2  along the second pole  320 A, and passes through the inner side of the first ring unit  210 A in the direction D 2  (6). 
     As shown in (C) of  FIG.  5   , the tip  21 A of the lace  20 A crosses over the outer side (direction D 3  side) of the first ring unit  210 A in the direction D 1  (7), moves in the direction D 1  along the second pole  320 A, crosses over the uppermost portion of the second pole  320 A in the direction D 4  (8), moves in the direction D 2  along the second pole  320 A and the first pole  220 A, and passes through the inner side of the first ring unit  210 A in the direction D 2  (9). That is, the lace  20 A hangs on the inner side of the second ring unit  310 A and hangs down in the direction D 2 . In this state, the lace  20 A sandwiches only the first pole  220 A. 
     As shown in (D) of  FIG.  5   , the tip  21 A of the lace  20 A passes through the inner side of the first ring unit  210 A in the direction D 1  (10), passes through the inner side of the second ring unit  310 A in the direction D 3  (11), and passes through the inner side of the first ring unit  210 A in the direction D 2  (12). As a result, the lace  20 A is in a state of being entangled only with the first pole  220 A and passing through the inner side of the third ring unit  410 A. 
     As shown in (E) of  FIG.  5   , the tip  21 A of the lace  20 A crosses over the side of the direction D 4  of the first ring unit  210 A, moves in the direction D 1  along the first pole  220 A and the second pole  320 A (13), crosses over the uppermost portion of the second pole  320 A in the direction D 3  (14), and moves in the direction D 2  along the second pole  320 A (15). As a result, the lace  20 A is in a state of being entangled only with the second pole  320 A. In this state, only the second pole  320 A exists at the inner side of the lace  20 A. 
     As shown in (F) of  FIG.  5   , the tip  21 A of the lace  20 A crosses over the outer side (direction D 4  side) of the third ring unit  410 A in the direction D 1 , passes through the inner side of the first ring unit  210 A in the direction D 1  (16), moves in the direction D 1  along the first pole  220 A, and passes through the inner side of the second ring unit  310 A in the direction D 4  (17). That is, the lace  20 A hangs on the inner side of the second ring unit  310 A and hangs down in the direction D 2 . In this state, the lace  20 A in the vicinity of the tip  21 A sandwiches the first pole  220 A and is positioned at the outer side of the first ring unit  210 A. A point that the lace  20 A does not pass through the inner side of the third ring unit  410 A (crosses over the outer side of the third ring unit  410 A) and a point that the lace  20 A sandwiches the first pole  220 A are differences between the state shown in (A) of  FIG.  5    and the state shown in (F) of  FIG.  5   . 
     As shown in (G) of  FIG.  5   , the tip  21 A of the lace  20 A crosses over the uppermost portion of the second pole  320 A in the direction D 3  (18), moves in the direction D 2  along the second pole  320 A, and passes through the inner side of the first ring unit  210 A in the direction D 2  (19). 
     As shown in (H) of  FIG.  5   , the tip  21 A of the lace  20 A crosses over the outer side (direction D 3  side) of the first ring unit  210 A in the direction D 1  (20), moves in the direction D 1  along the second pole  320 A, crosses over the uppermost portion of the second pole  320 A (21), moves in the direction D 2  along the second pole  320 A and the first pole  220 A, and crosses over the outer side (direction D 4  side) of the first ring unit  210 A (22). In this state, the lace  20 A is in a state of being entangled with the first pole  220 A and the second pole  320 A. 
     From this state, the tip  21 A of the lace  20 A moves in the reverse order of the above (20) to (22). That is, the tip  21 A crosses over the outer side (direction D 4  side) of the first ring unit  210 A in the direction D 1 , moves in the direction D 1  along the first pole  220 A and the second pole  320 A, crosses over the uppermost portion of the second pole  320 A in the direction D 3 , moves in the direction D 2  along the second pole  320 A, and crosses over the outer side (direction D 3  side) of the first ring unit  210 A in the direction D 2 . As a result, the lace  20 A is in a state of being entangled only with the third pole  420 A (a state in which the puzzle is solved). In this state, only the third pole  420 A exists at the inner side of the lace  20 A. 
     2. Second Embodiment 
     Wisdom ring puzzles  10 B and  100  according to the second embodiment will be described with reference to  FIG.  6 A  to  FIG.  8   .  FIG.  6 A  and  FIG.  6 B  are diagrams illustrating structures of wisdom ring puzzles according to embodiments of the present invention.  FIG.  7    to  FIG.  8    are diagrams showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. As in the first embodiment, the wisdom ring puzzles  10 B and  100  are puzzles using laces  20 B and  20 C. The player enjoys the wisdom ring puzzles  20 B and  20 C by entangling the laces with the poles (for example, second poles  320 B and  320 C) arranged on the wisdom ring puzzles  10 B and  100  or removing the laces from the poles. In the following description, description of the same configuration as that of the wisdom ring puzzle  10  of the first embodiment will be omitted. In the following description, in the case of describing the same configuration as the wisdom ring puzzle  10 , the description may be omitted by adding the letters “B” or “C” after the symbols shown in  FIG.  1 A . 
     [2-1. Structure of Wisdom Ring Puzzle  10 B] 
     As shown in  FIG.  6 A , the wisdom ring puzzle  10 B includes a stage  100 B, a first structure body  200 B, a second structure body  300 B, and a third structure body  400 B. 
     The first structure body  200 B includes a first ring unit  210 B and a first pole  220 B. The first ring unit  210 B is arranged on a first virtual plane substantially orthogonal to an upper surface  101 B. The first pole  220 B is connected to the first ring unit  210 B and has an upwardly convex U-shape. In other words, the first pole  220 B is connected to the first ring unit  210 B, extends in the direction D 1  from a connection part with the first ring unit  210 B, turns, extends in the direction D 2 , and reaches the stage  100 B. 
     The second structure body  300 B includes a second ring unit  310 B and the second pole  320 B. The second ring unit  310 B is arranged on a second virtual plane substantially orthogonal to the upper surface  101 B. The second pole  320 B is connected to the second ring unit  310 B and has an upwardly convex U-shape. In other words, the second pole  320 B is connected to the second ring unit  310 B, extends in the direction D 1  from the connection part with the second ring unit  310 B, turns, extends in the direction D 2 , and reaches the stage  100 B. 
     The third structure body  400 B includes a third pole  420 B. The third pole  420 B has an upwardly convex U-shaped shape. In other words, the third pole  420 B is connected to the stage  100 B, extends in the direction D 1  from the stage  100 B, turns and extends in the direction D 2 . A gap is arranged between a tip  430 B of the third pole  420 B extending in the direction D 2  and the stage  100 B. 
     The first ring unit  210 B is positioned in the direction D 1  with respect to the stage  100 B. The second ring unit  310 B is positioned in the direction D 1  with respect to the first ring unit  210 B. As described above, in the present embodiment, the first virtual plane on which the first ring unit  210 B is arranged and the second virtual plane on which the second ring unit  310 B is arranged are substantially orthogonal to the upper surface  101 B. That is, the first virtual plane and the second virtual plane are parallel to each other. However, the relationship between the first and second virtual planes and the upper surface  101 B is not limited to the above configuration. 
     The first ring unit  2108  is arranged in the direction D 4  with respect to the first pole  220 B. The second ring unit  310 B is arranged in the direction D 4  with respect to the second pole  320 B. The tip  430 B is arranged in the direction D 3  with respect to a position where the third pole  420 B is connected to the stage  1008 . That is, although the first pole  220 B and the second pole  320 B are folded back in the same direction (direction D 4 ), the third pole  420 B turns in the direction (direction D 3 ) opposite to the first pole  220 B and the second pole  320 B. 
     The above configuration will be described in detail. The first pole  220 B extends in the direction D 1  from the connection part with the first ring unit  210 B and is connected to the stage  100 B after passing through the inner side of the second ring unit  3108  in the direction D 3 . In a plan view, the first pole  220 B extends in the direction D 3  from the connection part with the first ring unit  210 B and is connected to the stage  100 B at a position between where the second pole  320 B is connected to the stage  100 B and the second ring unit  3108 . The second pole  320 B extends in the direction D 1  from the second ring unit  310 B and is connected to the stage  100 B at a position opposite to the first ring unit  210 B and the third pole  420 B in a plan view. The third pole  420 B extends in the direction D 1  from the stage  100 B and passes through the inner side of the first ring unit  210 B in the direction D 3 . Therefore, in a plan view, the tip  430 B is connected to the stage  220 B at a position between where the first pole  220 B is connected to the stage  100 B and the first ring unit  210 B. 
     In other words, in a plan view, the position where the first pole  220 B is connected to the stage  100 B is positioned between the position where the second pole  320 B is connected to the stage  100 B and the second ring unit  310 B. The second ring unit  310 B is positioned between a position where the first pole  220 B is connected to the stage  100 B and the first ring unit  210 B. 
     [2-2. Structure of Wisdom Ring Puzzle  100 ] 
     As shown in  FIG.  6 B , the wisdom ring puzzle  100  includes a stage  100 C, a first structure body  200 C, a second structure body  300 C, and a third structure body  400 C. The wisdom ring puzzle  100  shown in  FIG.  6 B  is similar to the wisdom ring puzzle  10 B shown in  FIG.  6 A , but the directions of the first structure body  200 C and the third structure body  400 C are different from the first structure body  200 B and the third structure body  400 B of the wisdom ring puzzle  10 B. In the following description, the difference between the wisdom ring puzzle  10 B and the wisdom ring puzzle  100  will be mainly explained. In the following description, in the case of describing the same configuration as the wisdom ring puzzle  10 B, the description may be omitted by adding the letter “C” instead of the letter “B” after the symbols shown in  FIG.  6 A . 
     As shown in  FIG.  6 B , in the wisdom ring puzzle  100 , the directions of the first structure body  200 C and the third structure body  400 C are opposite to the directions of the first structure body  200 B and the third structure body  400 B in  FIG.  6 A . That is, a first ring unit  210 C is arranged in the direction D 3  with respect to a first pole  220 C. A tip  430 C is arranged in the direction D 4  with respect to a position where a third pole  420 C is connected to the stage  100 C. That is, although the second pole  320 C and the third pole  420 C are folded back in the same direction (direction D 4 ) after extending in the direction D 1  from the stage  100 C, the first pole  220 C turns in the direction (direction D 3 ) opposite to the second pole  320 C and the third pole  420 C. 
     The above configuration will be described in detail. In a plan view, the first pole  220 C extends in the direction D 4  from the connection part with the first ring unit  210 C and is connected to the stage  100 C at a position further in the direction D 4  than the second ring unit  310 C. In a plan view, the second pole  320 C extends in the direction D 3  from the connection part with the second ring unit  310 C and is connected to the stage  100 C at a position crossing over the first ring unit  210 C and the third pole  420 C (direction D 3  side of the first ring unit  210 C and the third pole  420 C). 
     In other words, in a plan view, the first ring unit  210 C is positioned between a position where the second pole  320 C is connected to the stage  100 C and the second ring unit  310 C. The second ring unit  310 C is positioned between a position where the first pole  220 C is connected to the stage  100 C and the first ring unit  210 C. 
     In  FIG.  6 A  and  FIG.  6 B , although a configuration in which the first poles  220 B and  220 C pass through the inner side of the second ring units  310 B and  310 C in the vicinity of the uppermost portion of the first poles  220 B and  220 C, it is not limited to this configuration. The first poles  220 B and  220 C may pass through the inner side of the second ring units  310 B and  310 C from the connection part between the first ring units  210 B and  210 C and the first poles  220 B and  220 C to the position where the first poles  100 B and  100 C connect to the first pole  220 B. Therefore, for example, the second virtual plane on which the second ring units  310 B and  310 C are arranged may be parallel to the upper surface  101 B of the stage  100 B. Similarly, it is sufficient that the third poles  420 B and  420 C pass through the inner side of the first ring units  210 B and  210 C, and the first virtual plane arranged with the first ring units  210 B and  210 C may be parallel to the upper surface  101 B. 
     [2-3. Method of Solving Wisdom Ring Puzzle  10 B] 
     A method  1000 B of solving the wisdom ring puzzle  10 B shown in  FIG.  6 A  will be described with reference to  FIG.  7   . The wisdom ring puzzle  10 B is a puzzle targeting a state in which the lace  20 B is entangled only with the second pole  320 B (a state in which only the second pole  320 B exists at the inner side of the lace  20 B). 
     First, the lace  20 B is arranged so that the first structure body  200 B to the third structure body  400 B are all positioned on the inner side of the lace  20 B. That is, in a state where the lace  20 B is placed on the stage  100 B, the first pole  220 B to the third pole  420 B are sandwiched (surrounded) by the lace  20 B. From that state, as shown in (A) of  FIG.  7   , a tip  21 B of the lace  20 B passes through the inner side of the first ring unit  210 B in the direction D 3  (1), crosses over the lower side of the tip  430 B in the direction D 4  (2), and passes through the inner side of the first ring unit  210 B in the direction D 4  (3). According to this operation, a state in which only the first pole  220 B and the second pole  320 B exist on the inner side of the lace  20 B can be obtained. 
     As shown in (B) of  FIG.  7   , the tip  21 B of the lace  20 B moves upward along the first pole  220 B, passes through the inner side of the second ring unit  310 B in the direction D 4  (4), and crosses over the lower side of the tip  430 B in the direction D 4  (5). 
     As shown in (C) of  FIG.  7   , the tip  21 B of the lace  20 B crosses over the lower side of the first ring unit  210 B in the direction D 4 , turns and passes through the inner side of the first ring unit  210 B in the direction D 3  (6). 
     As shown in (D) of  FIG.  7   , the tip  21 B of the lace  20 B crosses over the lower side of the tip  430 B in the direction D 3  (7), moves upward along the third pole  420 B, and passes through the inner side of the first ring unit  210 B in the direction D 4  (8). In this state, the lace  20 B sandwiches the first ring unit  210 B from the outer side of the first ring unit  210 B. 
     As shown in (E) of  FIG.  7   , the tip  21 B of the lace  20 B moves in the direction D 1  on the outer side (direction D 4  side) of the first ring unit  210 B, moves in the direction D 1  along the first pole  220 B, and passes through the inner side of the second ring unit  310 B in the direction D 3  (9). According to the operation (9) described above, the lace  20 B is in a state of being entangled only with the second pole  320 B (a state in which the puzzle is solved). In this state, only the second pole  320 B exists at the inner side of the lace  20 B. 
     [2-4. Method of Solving Wisdom Ring Puzzle  100 ] 
     A method  1000 C of solving the wisdom ring puzzle  100  shown in  FIG.  6 B  will be described with reference to  FIG.  8   . The wisdom ring puzzle  100  is a puzzle targeting a state in which a lace  20 C is entangled only with the second pole  320 C (a state in which only the second pole  320 C exists at the inner side of the lace  20 C) like the wisdom ring puzzle  10 B. 
     As shown in (A) of  FIG.  8   , a tip  21 C of the lace  20 C passes through the inner side of the second ring unit  310 C in the direction D 3  (1), moves downward along the first pole  220 C, and passes through the inner side of the first ring unit  210 C in the direction D 4  (2). In this state, the lace  20 C sandwiches the first pole  220 C. 
     As shown in (B) of  FIG.  8   , the tip  21 C of the lace  20 C crosses over the lower side of the tip  430 C in the direction D 3  (3) and passes through the inner side of the first ring unit  210 C in the direction D 3  (4). Although the state shown in (B) of  FIG.  8    is similar to the state shown in (A) of  FIG.  8   , it is different in that the lace  20 C is entangled with the third pole  420 C. 
     As shown in (C) of  FIG.  8   , the tip  21 C of the lace  20 C crosses over the outer side (direction D 2  side) of the first ring unit  210 C in the direction D 4  and crosses over the side of the direction D 2  of the tip  430 C in the direction D 4  (5). 
     As shown in (D) of  FIG.  8   , the tip  21 C of the lace  20 C moves upward along the first pole  220 C, passes through the inner side of the second ring unit  310 C in the direction D 4  (6), and moves downward along the first pole  220 C. In this state, the lace  20 C is in a state of being entangled only with the first pole  220 C. That is, only the first pole  220 C exists at the inner side of the lace  20 C. 
     As shown in (E) of  FIG.  8   , the tip  21 C of the lace  20 C moves in the direction D 1  along the third pole  420 C, passes through the inner side of the first ring unit  210 C in the direction D 4 , and crosses over the side of the direction D 2  of the tip  430 C in the direction D 4  (7). 
     As shown in (F) of  FIG.  8   , the tip  21 C of the lace  20 C passes through the inner side of the first ring unit  210 C in the direction D 3  (9) and moves downward along the third pole  420 C. In this state, the lace  20 C is in a state of being entangled with the first pole  220 C and the third pole  420 C. That is, the first pole  220 C and the third pole  420 C exist on the inner side of the lace  20 C. 
     As shown in (G) of  FIG.  8   , while the position of the tip  21 C of the lace  20 C is maintained between the second pole  320 C and the third pole  420 C, the other end (not shown) of the lace  20 C moves in the direction D 1  along the first pole  220 C and the second pole  320 C (10), crosses over the uppermost portion of the second pole  320 C in the direction D 3  (10), and moves in the direction D 2  along the second pole  320 C (10). According to this operation, the lace  20 C is in a state of being entangled only with the second pole  320 C (a state in which the puzzle is solved). In this state, only the second pole  320 C exists at the inner side of the lace  20 C. 
     3. Third Embodiment 
     The wisdom ring puzzles  10 D and  10 E according to the third embodiment will be described with reference to  FIG.  9 A  to  FIG.  11   .  FIG.  9 A  and  FIG.  9 B  are diagrams illustrating structures of wisdom ring puzzles according to embodiments of the present invention.  FIG.  10    to  FIG.  11    are diagrams showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. As in the first and second embodiments, the wisdom ring puzzles  10 D and  10 E are puzzles using laces  20 D, and  20 E. The player enjoys the wisdom ring puzzles  20 D and  20 E by entangling the laces with the poles (for example, second poles  320 D and  320 E) arranged on the wisdom ring puzzles  10 D and  10 E or removing the laces from the poles. In the following description, description of the same configuration as that of the wisdom ring puzzle  10  of the first embodiment will be omitted. In the following description, in the case of describing the same configuration as the wisdom ring puzzle  10 , the description may be omitted by adding the letters “D” or “E” after the symbols shown in  FIG.  1 A . 
     [3-1. Structure of Wisdom Ring Puzzle  10 D] 
     As shown in  FIG.  9 A , the wisdom ring puzzle  10 D includes a stage  100 D, a first structure body  200 D, a second structure body  300 D, and a third structure body  400 D. 
     The first structure body  200 D includes a first ring unit  210 D and a first pole  220 D. The first ring unit  210 D is arranged on the first virtual plane substantially parallel to an upper surface  101 D. The first pole  220 D is connected to the first ring unit  210 D and has an upwardly convex U-shape. In other words, the first pole  220 D is connected to the first ring unit  210 D, extends in the direction D 1  from the connection part with the first ring unit  210 D, turns and extends in the direction D 2 . The first pole  220 D extending in the direction D 2  reaches the stage  100 D crossing over the outer side (direction D 3  side) of the first ring unit  210 D. In a plan view, the first pole  220 D is connected to the first ring unit  210 D at an end portion of the first ring unit  210 D in the direction D 4 . The first pole  220 D extends in the direction D 3  from the connection part with the first ring unit  210 D, crosses the first ring unit  210 D, and reaches the stage  100 D. 
     The second structure body  300 D includes a second ring unit  310 D and the second pole  320 D. The second ring unit  310 D is arranged on a second virtual plane substantially orthogonal to the upper surface  101 D. The second pole  320 D is connected to the second ring unit  310 D and has an upwardly convex U-shape. In other words, the second pole  320 D is connected to the second ring unit  310 D, extends in the direction D 1  from the connection part with the second ring unit  310 D, turns and extends in the direction D 2 , and reaches the stage  100 D. 
     The third structure body  400 D includes a third pole  420 D. The third pole  420 D has an upwardly convex U-shaped shape. In other words, the third pole  420 D is connected to the stage  100 D, extends in the direction D 1  from the stage  100 D, turns and extends in the direction D 2 . A gap is arranged between a tip  430 D of the third pole  420 D extending in the direction D 2  and the stage  100 D. 
     The first ring unit  210 D is positioned in the direction D 1  with respect to the stage  100 D. The second ring unit  310 D is positioned in the direction D 1  with respect to the first ring unit  210 D. As described above, in the present embodiment, the first virtual plane on which the first ring unit  210 D is arranged is substantially parallel to the upper surface  101 D, and the second virtual plane on which the second ring unit  310 D is arranged is substantially orthogonal to the upper surface  101 D. However, the present invention is not limited to the above configuration. For example, the angle formed by the upper surface  101 D and the first virtual plane may be smaller than the angle formed by the upper surface  101 D and the second virtual plane. 
     The first pole  220 D extends in the direction D 1  from the connection part with the first ring unit  210 D and crosses over the outer side (direction D 3  side) of the first ring unit  210 D in the direction D 2  after passing through the inner side of the second ring unit  310 D. Since the second ring unit  310 D is positioned in the direction D 1  with respect to the first ring unit  210 D, the first pole  220 D passes through the inner side of the second ring unit  310 D at the side of the direction D 1  of the first ring unit  210 D. In a plan view, the first pole  220 D extends from the connection part with the first ring unit  210 D toward (direction D 3 ) the position where the second pole  320 D is connected to the stage  100 D, passes through the inner side of the second ring unit  310 D, and is connected to the stage  100 D at a position crossing over the tip  430 D. In a plan view, the second pole  320 D extends in the direction D 3  from the second ring unit  310 D and is connected to the stage  100 D at a position crossing over the position where the first pole  220 D is connected to the stage  100 D. 
     The first ring unit  210 D is connected to the first pole  220 D at the side of the direction D 4  of the first pole  220 D. The second ring unit  310 D is arranged in the direction D 4  with respect to the second pole  320 D. The tip  430 D is arranged in the direction D 3  with respect to a position where the third pole  420 D is connected to the stage  100 D. That is, although the first pole  220 D and the second pole  320 D are folded back in the same direction (direction D 4 ), the third pole  420 D turns in the direction opposite to the first pole  220 D and the second pole  320 D (direction D 3 ). The third pole  420 D extends in the direction D 1  from the stage  100 D and passes through the inner side of the first ring unit  210 D in the direction D 1 . 
     In other words, in a plan view, the position where the first pole  220 D is connected to the stage  100 D is positioned between the position where the second pole  320 D is connected to the stage  100 D and the second ring unit  310 D. The second ring unit  310 D is positioned between the position where the first ring unit  210 D is connected to the first pole  220 D and the position where the first pole  220 D is connected to the stage  100 D. 
     [3-2. Structure of Wisdom Ring Puzzle  10 E] 
     As shown in  FIG.  9 B , a wisdom ring puzzle  10 E includes a stage  100 E, a first structure body  200 E, a second structure body  300 E, and a third structure body  400 E. The wisdom ring puzzle  10 E shown in  FIG.  9 B  is similar to the wisdom ring puzzle  10 D shown in  FIG.  9 A , but the directions of the first structure body  200 E and the third structure body  400 E are different from the first structure body  200 D and the third structure body  400 D of the wisdom ring puzzle  10 D. In the following description, the difference between the wisdom ring puzzle  10 D and the wisdom ring puzzle  10 E will be mainly explained. In the following description, in the case of describing the same configuration as the wisdom ring puzzle  10 D, the description may be omitted by adding the letter “E” instead of the letter “D” after the symbols shown in  FIG.  9 A . 
     As shown in  FIG.  9 B , in the wisdom ring puzzle  10 E, the directions of the first structure body  200 E and the third structure body  400 E are opposite to the directions of the first structure body  200 D and the third structure body  400 D in  FIG.  9 A . That is, the first ring unit  210 E is arranged in the direction D 3  with respect to a position where the first pole  220 E is connected to the stage  100 E. A tip  430 E is arranged in the direction D 4  with respect to a position where a third pole  420 E is connected to the stage  100 E. That is, the second pole  320 E and the third pole  420 E are folded back toward the same direction (direction D 3 ) after extending in the direction D 1  from the stage  100 E, but the first pole  220 E turns toward the opposite direction (direction D 4 ) from the second pole  320 E and the third pole  420 E after extending in the direction D 1  from the stage  100 E. 
     The above configuration will be described in detail. In a plan view, the first pole  220 E extends in the direction D 4  from a connection part with the first ring unit  210 E, passes through the inner side of a second ring unit  310 E, and is connected to the stage  100 E at a position crossing over the tip  430 E. In a plan view, the second pole  320 E extends in the direction D 3  from the second ring unit  310 E and is connected to the stage  100 E at a position crossing over the first ring unit  210 E. 
     In other words, in a plan view, the position where the first ring unit  210 E is connected to the first pole  220 E is positioned between the position where the second pole  320 E is connected to the stage  100 E and the second ring unit  310 E. The second ring unit  310 E is positioned between a position where the first ring unit  210 E is connected to the first pole  220 E and a position where the first pole  220 E is connected to the stage  100 E. 
     In  FIG.  9 A  and  FIG.  9 B , although a configuration in which the first poles  220 D and  220 E pass through the inner side of the second ring units  310 D and  310 E in the vicinity of the uppermost portion of the first poles  220 D and  220 E is shown, it is not limited to this configuration. It is sufficient that the first poles  220 D and  220 E pass through the inner side of the second ring units  310 D and  310 E between the connection part between the first ring units  210 D and  210 E and the position where the first poles  100 D and  100 E connect to the first pole  220 D. Therefore, for example, the second virtual plane on which the second ring units  310 D and  310 E are arranged may be parallel to the upper surface  101 D of the stage  100 D. Similarly, it is sufficient that the third poles  420 D and  420 E pass through the inner side of the first ring units  210 D and  210 E, and the first virtual plane arranged with the first ring units  210 D and  210 E may not be parallel to the upper surface  101 D. 
     [3-3. Method of Solving Wisdom Ring Puzzle  10 D] 
     A method  1000 D of solving the wisdom ring puzzle  10 D shown in  FIG.  9 A  will be described with reference to  FIG.  10   . The wisdom ring puzzle  10 D is a puzzle targeting a state in which the lace  20 D is entangled only with the second pole  320 D (a state in which only the second pole  320 D exists at the inner side of the lace  20 D). 
     First, the lace  20 D is arranged so that the first structure body  200 D to the third structure body  400 D are all positioned on the inner side of the lace  20 D. That is, in a state where the lace  20 D is placed on the stage  100 D, the first pole  220 D to the third pole  420 D are sandwiched (surrounded) by the lace  20 D. From that state, as shown in (A) of  FIG.  10   , the tip  21 D of the lace  20 D passes through the inner side of the first ring unit  210 D in the direction D 1  (1). 
     As shown in (B) of  FIG.  10   , the tip  21 D of the lace  20 D moves in the direction D 2  toward the tip  430 D between the third pole  420 D and the first pole  220 D, crosses over the tip  430 D in the direction D 4  (2), and moves in the direction D 4  with respect to the third pole  420 D in the direction D 1  (2). Thereafter, the tip  21 D passes through the inner side of the first ring unit  210 D in the direction D 2  (3). According to this operation, a state in which only the first pole  220 D and the second pole  320 D exist on the inner side of the lace  20 D can be obtained. 
     As shown in (C) of  FIG.  10   , the tip  21 D of the lace  20 D moves between the third pole  420 D and the first pole  220 D in the direction D 1  (4) and passes through the inner side of the second ring unit  310 D in the direction D 4  (5). That is, the lace  20 D hangs on the inner side of the second ring unit  310 D and hangs down in the direction D 2 . 
     As shown in (D) of  FIG.  10   , the tip  21 D of the lace  20 D crosses over the uppermost portion of the third pole  420 D in the direction D 3  (6), moves in the direction D 2  toward the tip  430 D between the third pole  420 D and the first pole  220 D (7), and crosses over the tip  430 D in the direction D 4 . In this state, the lace  20 D sandwiches the first ring unit  210 D from the outer side of the first ring unit  210 D. 
     As shown in (E) of  FIG.  10   , the tip  21 D of the lace  20 D passes through the inner side of the first ring unit  210 D in the direction D 1  (8). That is, the lace  20 D enters the inner side of the first ring unit  210 D from the outer side of the first ring unit  210 D. 
     As shown in (F) of  FIG.  10   , the tip  21 D of the lace  20 D crosses over the outer side (direction D 3  side) of the first ring unit  210 D in the direction D 2  (9), moves in the direction D 2  along the third pole  420 D, crosses over the tip  430 D in the direction D 3 , moves in the direction D 1  between the third pole  420 D and the first pole  220 D (10), and moves in the direction D 1  along the third pole  21 D. 
     As shown in (G) of  FIG.  10   , the tip  21 D of the lace  20 D crosses over the uppermost portion of the third pole  420 D in the direction D 4  and passes through the inner side of the first ring unit  210 D in the direction D 2  (11). In this state, the lace  20 D in the vicinity of the tip  21 D is positioned at the outer side of the first ring unit  210 D. This is the difference between the state shown in (C) of  FIG.  10    and the state shown in (G) of  FIG.  10   . 
     As shown in (H) of  FIG.  10   , the tip  21 D of the lace  20 D crosses over the outer side (direction D 4  side) of the first ring unit  210 D in the direction D 1  (12), moves in the direction D 1  along the first pole  220 D (12), and passes through the inner side of the second ring unit  310 D in the direction D 3  (13). Thereafter, as the tip  21 D moves along the first pole  220 D in the direction D 2 , the lace  20 D is in a state of being entangled only with the second pole  320 D (a state in which the puzzle is solved). In this state, only the second pole  320 D exists at the inner side of the lace  20 D. 
     [3-4. Method of Solving Wisdom Ring Puzzle  10 E] 
     A method  1000 E of solving the wisdom ring puzzle  10 E shown in  FIG.  9 B  will be described with reference to  FIG.  11   . The wisdom ring puzzle  10 E is a puzzle targeting a state in which a lace  20 E is entangled only with the second pole  320 E (a state in which only the second pole  320 E exists at the inner side of the lace  20 E). 
     As shown in (A) of  FIG.  11   , a tip  21 E of the lace  20 E passes through the inner side of the second ring unit  310 E in the direction D 3  (1) and moves in the direction D 2  along the first pole  220 E (2). In this state, the lace  20 E in the vicinity of the tip  21 E is positioned at the outer side of the first ring unit  210 E. 
     As shown in (B) of  FIG.  11   , the tip  21 E of the lace  20 E passes through the inner side of the first ring unit  210 E in the direction D 1  (3). That is, the lace  20 E enters the inner side of the first ring unit  210 E from the outer side of the first ring unit  210 E. 
     As shown in (C) of  FIG.  11   , the tip  21 E of the lace  20 E crosses over the uppermost portion of the third pole  420 E in an area in the direction D 2  with respect to the second ring unit  310 E (4), moves in the direction D 2  between the third pole  420 E and the first pole  220 E, and crosses over the tip  430 E in the direction D 2 . 
     As shown in (D) of  FIG.  11   , the tip  21 E of the lace  20 E crosses over the side of the direction D 1  of the first ring unit  210 E from the outer side of the first ring unit  210 E and passes through the inner side of the first ring unit  210 E in the direction D 2  (6). 
     As shown in (E) of  FIG.  11   , the tip  21 E of the lace  20 E crosses over the tip  430 E in the direction D 4  and moves in the direction D 1  between the third pole  420 E and the first pole  220 E (7). 
     As shown in (F) of  FIG.  11   , the tip  21 E of the lace  20 E crosses over the uppermost portion of the third pole  420 E in the direction D 3  in an area in the direction D 2  with respect to the second ring unit  310 E (8), passes through the inner side of the second ring unit  310 E in the direction D 4  (9), moves between the third pole  420 E and the first pole  220 E in the direction D 2  (10), and crosses over the tip  430 E in the direction D 2 . In this state, the lace  20 E is in a state of being entangled only with the first pole  220 E. In this state, only the first pole  220 E exists at the inner side of the lace  20 E. 
     As shown in (G) of  FIG.  11   , the tip  21 E of the lace  20 E passes through the inner side of the first ring unit  210 E in the direction D 1 , crosses over the side of the direction D 1  of the first ring unit  210 E in the direction D 4 , and moves in the direction D 4  with respect to the first ring unit  210 E in the direction D 2  (11). That is, the lace  20 E is hung on the first ring unit  210 E such that the tip  21 E is directed from the inner side to the outer side of the first ring unit  210 E. 
     As shown in (H) of  FIG.  11   , the tip  21 E of the lace  20 E crosses over the tip  430 E in the direction D 4 , moves in the direction D 1  between the third pole  420 E and the first pole  220 E (12), crosses over the uppermost portion of the third pole  420 E in the direction D 3  in an area in the direction D 2  with respect to the second ring unit  310 E, and passes through the inner side of the first ring unit  210 E in the direction D 2  (13). In this state, the lace  20 E is entangled with the first pole  220 E and the third pole  420 E. In this state, only the first pole  220 E and the third pole  420 E exist on the inner side of the lace  20 E. 
     From the state shown in (H) of  FIG.  11   , while the position of the tip  21 E of the lace  20 E is maintained between the second pole  320 E and the third pole  420 E, the other end (not shown) of the lace  20 E moves in the direction D 1  along the first pole  220 E and the second pole  320 E, crosses over the uppermost portion of the second pole  320 E in the direction D 3 , and moves in the direction D 2  along the second pole  320 E (14). According to this operation, the lace  20 E is in a state of being entangled only with the second pole  320 E (a state in which the puzzle is solved). In this state, only the second pole  320 E exists at the inner side of the lace  20 E. 
     4. Fourth Embodiment 
     A wisdom ring puzzle  10 F according to the fourth embodiment will be described with reference to  FIG.  12    to  FIG.  16   .  FIG.  12    is a diagram illustrating a structure of a wisdom ring puzzle according to an embodiment of the present invention.  FIG.  13    to  FIG.  16    are diagrams showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. As in the first to third embodiments, the wisdom ring puzzle  10 F is a puzzle using a lace  20 F. The player enjoys the wisdom ring puzzle  10 F by entangling the lace  20 F with a pole (for example, a second pole  320 F) arranged on the wisdom ring puzzle  10 F or removing the lace  20 F from the pole. In the following description, description of the same configuration as that of the wisdom ring puzzle  10  of the first embodiment will be omitted. In the following description, in the case of describing the same configuration as the wisdom ring puzzle  10 , the description may be omitted by adding the letter “F” after the symbols shown in  FIG.  1 A . 
     [4-1. Structure Wisdom Ring Puzzle  10 F] 
     As shown in  FIG.  12   , the wisdom ring puzzle  10 F includes a stage  100 F, a first structure body  200 F, a second structure body  300 F, a third structure body  500 F, and a fourth structure body  600 F. 
     The first structure body  200 F includes a first ring unit  210 F and a first pole  220 F. The first ring unit  210 F is arranged on a first virtual plane substantially parallel to an upper surface  101 F. The first pole  220 F is connected to the first ring unit  210 F and has an upwardly convex U-shaped shape. In other words, the first pole  220 F is connected to the first ring unit  210 F, extends in the direction D 1  from a connection part with the first ring unit  210 F, turns and extends in the direction D 2 . The first pole  220 F extending in the direction D 2  passes through the inner side of the first ring unit  210 F and reaches the stage  100 F. In a plan view, the first pole  220 F is connected to the first ring unit  210 F at an end portion of the first ring unit  210 F in the direction D 3 . In a plan view, the first pole  220 F extends in the direction D 4  from the connection part with the first ring unit  210 F and reaches the stage  100 F at the inner side of the first ring unit  210 F. 
     The second structure body  300 F includes a second ring unit  310 F and a second pole  320 F. The second ring unit  310 F is arranged on a second virtual plane substantially orthogonal to the upper surface  101 F. The second pole  320 F extends from an end portion of the second ring unit  310 F in the direction D 2  toward the stage  100 F and is connected to the stage  100 F. However, a position where the second pole  320 F is connected to the second ring unit  310 F is not limited to the above-described configuration. 
     The third structure body  500 F includes a third ring unit  510 F and a third pole  520 F. The third ring unit  510 F is arranged on a third virtual plane substantially parallel to the upper surface  101 F. The third pole  520 F is connected to the third ring unit  510 F and has an upwardly convex U-shaped shape. In other words, the third pole  520 F is connected to the third ring unit  510 F, extends in the direction D 1  from a connection part with the third ring unit  510 F, turns and extends in the direction D 2 . The third pole  520 F extending in the direction D 2  passes through the inner side of the third ring unit  510 F and reaches the stage  100 F. In a plan view, the third pole  520 F is connected to the third ring unit  510 F at an end portion of the third ring unit  510 F in the direction D 4 . In a plan view, the third pole  520 F extends in the direction D 3  from a connection part with the third ring unit  510 F and reaches the stage  100 F at the inner side of the third ring unit  510 F. Although details will be described later, in the present embodiment, the first pole  220 F and the third pole  520 F are partially common. Therefore, in the following description, a part of the third pole  520 F that is in common with the first pole  220 F may be referred to as the first pole  220 F. However, the first pole  220 F and the third pole  520 F may be independent. Further, a position where the third pole  520 F is connected to the third ring unit  510 F is not limited to the above-described configuration. 
     The fourth structure body  600 F includes a fourth ring unit  610 F and a fourth pole  620 F. The fourth ring unit  610 F is arranged on a fourth virtual plane substantially orthogonal to the upper surface  101 F. The fourth pole  620 F extends from an end portion of the fourth ring unit  610 F in the direction D 2  toward the stage  100 F and is connected to the stage  100 F. However, a position where the fourth pole  620 F is connected to the fourth ring unit  610 F is not limited to the above-described configuration. 
     The first ring unit  210 F is positioned in the direction D 1  with respect to the stage  100 F. The second ring unit  310 F is positioned in the direction D 1  with respect to the first ring unit  210 F. The third ring unit  510 F is positioned in the direction D 1  with respect to the first ring unit  210 F. The fourth ring unit  610 F is positioned in the direction D 1  with respect to the third ring unit  510 F. As described above, in the present embodiment, the first virtual plane on which the first ring unit  210 F is arranged and the third virtual plane on which the third ring unit  510 F is arranged are substantially parallel to the upper surface  101 F. The second virtual plane on which the second ring unit  310 F is arranged and the fourth virtual plane on which the fourth ring unit  610 F is arranged are substantially orthogonal to the upper surface  101 F. However, the present invention is not limited to the above configuration. For example, the angle formed by the upper surface  101 F and the first virtual plane and the angle formed by the upper surface  101 F and the third virtual plane may be smaller than the angle formed by the upper surface  101 F and the second virtual plane and the angle formed by the upper surface  101 F and the fourth virtual plane. 
     In the present embodiment, although the configuration in which all of the fourth ring units  610 F are positioned in the direction D 1  with respect to the third ring unit  510 F is exemplified, the configuration is not limited to this configuration. For example, a part of the fourth ring unit  610 F may be positioned in the direction D 1  with respect to the third ring unit  510 F. That is, when viewed from the side, the third ring unit  510 F and the fourth ring unit  610 F may intersect. 
     The first pole  220 F extends in the direction D 1  from the connection part with the first ring unit  210 F, passes through the inner side of the second ring unit  310 F, and then passes through the inner side of the first ring unit  210 F in the direction D 2 . In the present embodiment, although the first pole  220 F passes through the inner side of the second ring unit  310 F in the vicinity of the uppermost portion of the first pole  220 F, it is not limited to this configuration. For example, it is sufficient that the first pole  220 F passes through the inner side of the second ring unit  310 F between the connection part with the first ring unit  210 F and the position passing through the inner side of the first ring unit  210 F in the direction D 2 . In a plan view, the first pole  220 F extends from the connection part with the first ring unit  210 F toward the fourth pole  620 F (direction D 4 ), passes through the inner side of the second ring unit  310 F, and is connected to the stage  100 F in an area where the first ring unit  210 F and the third ring unit  510 F overlap. 
     The second pole  320 F extends in the direction D 2  from the end portion of the second ring unit  310 F in the direction D 2 . The second pole  320 F passes through the inner side of the first ring unit  210 F in the direction D 2  and is connected to the stage  100 F. 
     The third pole  520 F extends in the direction D 1  from the connection part with the third ring unit  510 F, passes through the inner side of the fourth ring unit  610 F, and then passes through the inner side of the third ring unit  510 F in the direction D 2 . In the present embodiment, although the third pole  520 F passes through the inner side of the fourth ring unit  610 F in the vicinity of the uppermost portion of the third pole  520 F, it is not limited to this configuration. For example, it is sufficient that the third pole  520 F passes through the inner side of the fourth ring unit  610 F between the connection part with the third ring unit  510 F and the position passing through the inner side of the third ring unit  510 F in the direction D 2 . In a plan view, the third pole  520 F extends from the connection part with the third ring unit  510 F toward the second pole  320 F (direction D 3 ), passes through the inner side of the fourth ring unit  610 F, and is connected to the stage  100 F in an area where the first ring unit  210 F and the third ring unit  510 F overlap. 
     The fourth pole  620 F extends in the direction D 2  from the end portion of the fourth ring unit  610 F in the direction D 2 . The fourth pole  620 F passes through the inner side of the third ring unit  510 F in the direction D 2  and is connected to the stage  100 F. 
     [4-2. Method of Solving Wisdom Ring Puzzle  10 F (Part 1)] 
     A method  1000 F of solving the wisdom ring puzzle  10 F shown in  FIG.  12    will be described with reference to  FIG.  13    and  FIG.  14   . The wisdom ring puzzle  10 F is a puzzle targeting a state in which the lace  20 F is entangled only with the second pole  320 F (a state in which only the second pole  320 F exists at the inner side of the lace  20 F). 
     In the method of solving the wisdom ring puzzle  10 F, since the method up to the state of (A) of  FIG.  13    is the same as that of (A) of  FIG.  2    to (D) of  FIG.  2   , description thereof will be omitted. Also, the first structure body  200  in  FIG.  2    corresponds to the fourth structure body  500 F in  FIG.  12   , the second structure body  300  in  FIG.  2    corresponds to the fourth structure body  600 F in  FIG.  12   , and the third structure body  400  in  FIG.  2    corresponds to the first structure body  200 F and the second structure body  300 F in  FIG.  12   . The state of (A) of  FIG.  13    is a state in which the lace  20 F is entangled with the first pole  220 F (the third pole  520 F) and the second pole  320 F. 
     As shown in (B) of  FIG.  13   , the tip  21 F of the lace  20 F passes through the inner side of the first ring unit  210 F in the direction D 1  (1), moves in the direction D 1  along the third pole  520 F, passes through the inner side of the fourth ring unit  610 F in the direction D 4  (2), and passes through the inner side of the third ring unit  510 F in the direction D 2  (3). That is, the lace  20 F hangs on the inner side of the fourth ring unit  610 F and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 F. 
     As shown in (C) of  FIG.  13   , the tip  21 F of the lace  20 F crosses over the outer side (direction D 2  side) of the third ring unit  510 F while maintaining a state in which the lace  20  sandwiches the third ring unit  510 F (4), moves in the direction D 1  along the third pole  520 F, crosses over the fourth ring unit  601 F in the direction D 3  (5), moves in the direction D 2  along the third pole  520 F (6), and crosses over the outer side (direction D 3  side) of the third ring unit  510 F (7). In this case, the tip  21 F of the lace  20 F is in a state where it can be caught at a branch point between the third pole  520 F and the first pole  220 F. 
     As shown in (D) of  FIG.  13   , the tip  21 F of the lace  20 F passes through the inner side of the third ring unit  510 F in the direction D 1  (8), crosses over the fourth ring unit  610 F in the direction D 4  (9), and moves in the direction D 2  along the third pole  520 F. In this state, the lace  20 F in the vicinity of the tip  21 F is positioned at the outer side of the third ring unit  510 F. 
     As shown in (E) of  FIG.  13   , the tip  21 F of the lace  20 F moves in the direction D 1  along the third pole  520 F, passes through the inner side of the fourth ring unit  610 F in the direction D 3  (10), moves in the direction D 2  along the third pole  520 F (11), and passes through the inner side of the third ring unit  510 F in the direction D 2  (12). In this case, the tip  21 F of the lace  20 F is in a state where it can be caught at the branch point between the third pole  520 F and the first pole  220 F. In this state, the lace  20 F sandwiches the first pole  220 F and the second pole  320 F. 
     As shown in (F) of  FIG.  13   , the tip  21 F of the lace  20 F passes through the inner side of the second ring unit  310 F in the direction D 3  (13). In this state, the lace  20 F sandwiches the first pole  220 F and the first pole  220 F. 
     As shown in (G) of  FIG.  13   , the tip  21 F of the lace  20 F crosses over the second ring unit  310 F in the direction D 4  (14), passes through the inner side of the third ring unit  510 F in the direction D 1  (15), moves in the direction D 1  along the third pole  520 F, and passes through the inner side of the fourth ring unit  610 F in the direction D 4 . In this state, the lace  20 F in the vicinity of the tip  21 F is positioned at the outer side of the third ring unit  510 F. 
     As shown in (H) of  FIG.  13   , the tip  21 F of the lace  20 F crosses over the fourth ring unit  610 F in the direction D 3  (17). Thereafter, the tip  21 F moves in the direction D 2  along the third pole  520 F, passes through the inner side of the third ring unit  510 F in the direction D 2  (18), turns and crosses over the outer side (direction D 3  side) of the third ring unit  510 F in the direction D 1  (18). Then, the tip  21 F crosses over the fourth ring unit  610 F in the direction D 4  (18). In this state, the lace  20 F hangs on the inner side of the fourth ring unit  610 F and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 F. 
     As shown in (A) of  FIG.  14   , the tip  21 F of the lace  20 F passes through the inner side of the third ring unit  510 F in the direction D 1 , passes through the inner side of the fourth ring unit  610 F in the direction D 3 , and passes through the inner side of the third ring unit  510 F in the direction D 2  (20). Thereafter, the tip  21 F moves in the direction D 2  along the third pole  520 F and passes through the inner side of the first ring unit  210 F in the direction D 2  (21). 
     As shown in (B) of  FIG.  14   , the tip  21 F of the lace  20 F crosses over the outer side (direction D 4  side) of the first ring unit  210 F in the direction D 1  (22), moves in the direction D 1  along the third pole  520 F and the fourth pole  620 F, passes through the inner side of the third ring unit  510 F in the direction D 1  (23), passes through the inner side of the fourth ring unit  610 F in the direction D 4  (24), moves in the direction D 2  along the fourth pole  620 F, and passes through the inner side of the third ring unit  510 F in the direction D 2  (25). In this state, the lace  20 F hangs on the inner side of the fourth ring unit  610 F and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 F. 
     As shown in (C) of  FIG.  14   , the tip  21 F of the lace  20 F crosses over the outer side (direction D 4  side) of the third ring unit  510 F in the direction D 1  (26), moves in the direction D 1  along the third pole  520 F, crosses over the fourth ring unit  610 F in the direction D 3  (27), moves in the direction D 2  along the third pole  520 F, and crosses over the outer side (direction D 3  side) of the third ring unit  510 F in the direction D 2  (28). 
     As shown in (D) of  FIG.  14   , the tip  21 F of the lace  20 F passes through the inner side of the third ring unit  510 F in the direction D 1  (29) and crosses over the fourth ring unit  610 F in the direction D 4  (30). 
     As shown in (E) of  FIG.  14   , the tip  21 F of the lace  20 F moves in the direction D 1  along the third pole  520 F, passes through the inner side of the fourth ring unit  610 F in the direction D 3  (31), moves in the direction D 2  along the third pole  520 F, and passes through the inner side of the third ring unit  510 F in the direction D 2  (32). 
     As shown in (F) of  FIG.  14   , the tip  21 F of the lace  20 F crosses over the second ring unit  310 F in the direction D 3  (33). When the lace  20 F extending from the tip  21 F is pulled in this state (34), the lace  20 F is in a state of being entangled only with the second pole  320 F (a state in which the puzzle is solved). In this state, only the second pole  320 F exists at the inner side of the lace  20 F. 
     [4-3. Method of Solving Wisdom Ring Puzzle  10 F (Part 2)] 
     Another method  1000 F of solving the wisdom ring puzzle  10 F shown in  FIG.  12    will be described with reference to  FIG.  15    and  FIG.  16   . Unlike the method (Part 1) shown in  FIG.  13    and  FIG.  14   , the method (Part 2) shown in  FIG.  15    and  FIG.  16    starts with the lace  20 F not being entangled with any of the poles. 
     As shown in (A) of  FIG.  15   , the tip  21 F of the lace  20 F passes through the inner side of the first ring unit  210 F in the direction D 1  between the second pole  320 F and the first pole  220 F (third pole  520 F) (1). Thereafter, the tip  21 F moves in the direction D 1  along the second pole  320 F, passes through the inner side of the second ring unit  310 F in the direction D 3  (2), moves in the direction D 2  along the second pole  320 F, and passes through the inner side of the first ring unit  210 F in the direction D 2 . 
     As shown in (B) of  FIG.  15   , the tip  21 F of the lace  20 F crosses over the outer side (direction D 3  side) of the first ring unit  210 F in the direction D 1  (4), crosses over the second ring unit  310 F in the direction D 4  (5), passes through the inner side of the third ring unit  510 F in the direction D 1  (6), and passes through the inner side of the fourth ring unit  610 F in the direction D 4  (7). In this state, the lace  20 F in the vicinity of the tip  21 F is positioned at the outer side of the third ring unit  510 F. 
     As shown in (C) of  FIG.  15   , the tip  21 F of the lace  20 F crosses over the fourth ring unit  610 F in the direction D 3  (8), moves in the direction D 2  along the third pole  520 F, passes through the inner side of the third ring unit  510 F in the direction D 2  (9), turns and crosses over the outer side (direction D 3  side) of the third ring unit  510 F in the direction D 1  (9). Thereafter, the tip  21 F moves in the direction D 1  along the third pole  520 F (10), and crosses over the fourth ring unit  610 F in the direction D 4  (11). In this state, the lace  20 F hangs on the inner side of the fourth ring unit  610 F and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 F. 
     As shown in (D) of  FIG.  15   , the tip  21 F of the lace  20 F passes through the inner side of the third ring unit  510 F in the direction D 1  (12), passes through the inner side of the fourth ring unit  610 F in the direction D 3  (13), passes through the inner side of the third ring unit  510 F in the direction D 2  (14), and crosses over the outer side (direction D 4  side) of the first ring unit  210 F in the direction D 2 . 
     As shown in (E) of  FIG.  15   , the tip  21 F of the lace  20 F passes through the inner side of the first ring unit  210 F in the direction D 1  (16), moves in the direction D 1  along the third pole  520 F, passes through the inner side of the third ring unit  510 F in the direction D 1  (17), passes through the inner side of the fourth ring unit  610 F in the direction D 4  (18), and passes through the inner side of the third ring unit  510 F in the direction D 2  (19). In this state, the lace  20 F hangs on the inner side of the fourth ring unit  610 F and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 F. 
     As shown in (F) of  FIG.  15   , the tip  21 F of the lace  20 F crosses over the outer side (direction D 4  side) of the third ring unit  510 F in the direction D 1  (20), moves in the direction D 1  along the third pole  520 F, and crosses over the fourth ring unit  610 F in the direction D 3  (21). Thereafter, the tip  21 F crosses over the outer side (direction D 3  side) of the third ring unit  510 F in the direction D 2 , turns, passes through the inner side of the third ring unit  510 F in the direction D 1  (22), moves in the direction D 1  along the third pole  520 F, and crosses over the fourth ring unit  610 F in the direction D 4  (23). In this state, the lace  20 F in the vicinity of the tip  21 F is positioned at the outer side of the third ring unit  510 F. This is the difference between the state shown in (E) of  FIG.  15    and the state shown in (F) of  FIG.  15   . 
     As shown in (G) of  FIG.  15   , the tip  21 F of the lace  20 F passes through the inner side of the fourth ring unit  610 F in the direction D 3  (24), moves in the direction D 2  along the third pole  520 F, passes through the inner side of the third ring unit  510 F in the direction D 2  (25), crosses over the second ring unit  310 F in the direction D 3  (26), moves in the direction D 2  along the first pole  220 F, and crosses over the outer side (direction D 3  side) of the first ring unit  210 F in the direction D 2 . 
     As shown in (H) of  FIG.  15   , the tip  21 F of the lace  20 F passes through the inner side of the second ring unit  310 F in the direction D 4  (27). In this state, the lace  20 F passes through the inner side of the first ring unit  210 F and turns so as to sandwich the first pole  220 F at the side of the direction D 1  of the first ring unit  210 F. 
     As shown in (A) of  FIG.  16   , the tip  21 F of the lace  20 F passes through the inner side of the third ring unit  510 F in the direction D 1  (28), moves in the direction D 1  along the third pole  520 F, and passes through the inner side of the fourth ring unit  610 F in the direction D 4  (29). In this state, the lace  20 F in the vicinity of the tip  21 F is positioned at the outer side of the third ring unit  510 F. 
     As shown in (B) of  FIG.  16   , the tip  21 F of the lace  20 F crosses over the fourth ring unit  610 F in the direction D 3  (30). Thereafter, the tip  21 F moves in the direction D 2  along the third pole  520 F, passes through the inner side of the third ring unit  510 F in the direction D 2 , turns and crosses over the outer side (direction D 3  side) of the third ring unit  510 F in the direction D 1  (31). Then, the tip  21 F crosses over the fourth ring unit  610 F in the direction D 3  (32). In this state, the lace  20 F hangs on the inner side of the fourth ring unit  610 F and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 F. 
     As shown in (C) of  FIG.  16   , the tip  21 F of the lace  20 F passes through the inner side of the third ring unit  510 F in the direction D 1  (33), passes through the inner side of the fourth ring unit  610 F in the direction D 3  (34), moves in the direction D 2  along the third pole  520 F, passes through the inner side of the third ring unit  510 F in the direction D 2  (35), and further passes through the inner side of the first ring unit  210 F in the direction D 2  (36). In this state, the lace  20 F is entangled only with the first pole  220 F (or the first pole  220 F and the third pole  520 F). 
     As shown in (D) of  FIG.  16   , the tip  21 F of the lace  20 F crosses over the outer side (direction D 4  side) of the first ring unit  210 F in the direction D 1  (37), moves in the direction D 1  along the third ring unit  520 F, passes through the inner side of the third ring unit  510 F in the direction D 1  (38), further moves in the direction D 1  along the third ring unit  520 F, passes through the inner side of the fourth ring unit  610 F in the direction D 4  (39), and passes through the inner side of the third ring unit  510 F in the direction D 2  (40). 
     As shown in (E) of  FIG.  16   , the tip  21 F of the lace  20 F crosses over the outer side (direction D 4  side) of the third ring unit  510 F in the direction D 1  (41), moves in the direction D 1  along the third pole  520 F, crosses over the fourth ring unit  610 F in the direction D 3  (42), moves in the direction D 2  along the third pole  520 F, and crosses over the outer side (direction D 3  side) of the third ring unit  510 F in the direction D 2  (43). 
     As shown in (F) of  FIG.  16   , the tip  21 F of the lace  20 F turns after crossing over the outer side of the third ring unit  510 F in the direction D 2 , passes through the inner side of the third ring unit  510 F in the direction D 1  (44), further moves in the direction D 1  along the third pole  520 F, and crosses over the fourth ring unit  610 F in the direction D 4  (45). In this state, the lace  20 F in the vicinity of the tip  21 F is positioned at the outer side of the third ring unit  510 F. 
     As shown in (G) of  FIG.  16   , the tip  21 F of the lace  20 F passes through the inner side of the fourth ring unit  610 F in the direction D 3  (46), moves in the direction D 2  along the third pole  520 F, and passes through the inner side of the third ring unit  510 F in the direction D 2  (47). Then, as shown in (H) of  FIG.  16   , the tip  21 F crosses over the second ring unit  310 F in the direction D 3 , so that the lace  20 F is in a state of being entangled only with the second pole  320 F (a state in which the puzzle is solved). In this state, only the second pole  320 F exists at the inner side of the lace  20 F. 
     5. Fifth Embodiment 
     A wisdom ring puzzle  10 G according to a fifth embodiment will be described with reference to  FIG.  17    to  FIG.  21   .  FIG.  17    is a diagram illustrating a structure of a wisdom ring puzzle according to an embodiment of the present invention.  FIG.  18    to  FIG.  21    are diagrams showing a method of solving a wisdom ring puzzle according to an embodiment of the present invention. As in the first to fourth embodiments, the wisdom ring puzzle  10 G is a puzzle using a lace  20 G. The player enjoys the wisdom ring puzzle  20 G by entangling the lace with a pole arranged on the wisdom ring puzzle  10 G (for example, a second pole  320 G) or removing the lace from the pole. In the following description, description of the same configuration as that of the wisdom ring puzzle  10 F of the fourth embodiment will be omitted. In the following description, in the case of describing the same configuration as the wisdom ring puzzle  10 F, the description may be omitted by adding the letter “G” instead of the letter “F” after the symbols shown in  FIG.  12   . 
     [5-1. Structure of Wisdom Ring Puzzle  10 G] 
     A fourth pole  620 G extends in the direction D 1  from an end portion of a fourth ring unit  610 G in the direction D 1 , turns and extends in the direction D 2 . The fourth pole  620 G extending in the direction D 2  passes through the inner side of each of a third ring unit  510 G and a first ring unit  210 G and reaches a stage  100 G. In a plan view, the fourth pole  620 G extends from a connection part with the fourth ring unit  610 G toward the second pole  320 G (D 3 ) and is connected to the stage  100 G at a position crossing over a third pole  520 G and at a position where the third ring unit  510 G and the first ring unit  210 G overlap. 
     Although the fourth ring unit  610 F is positioned at the uppermost portion in the wisdom ring puzzle  10 F shown in  FIG.  12   , the fourth pole  620 G is positioned at the uppermost portion in the wisdom ring puzzle  10 G shown in  FIG.  17   . Further, the wisdom ring puzzle  10 G of  FIG.  17    is different from the wisdom ring puzzle  10 F of  FIG.  12    in that the fourth pole  620 G (the first pole  220 G) passes through each of the inner sides of the third ring unit  510 G and the first ring unit  210 G in the wisdom ring puzzle  10 G while the third pole  520 F passes through each of the inner sides of the third ring unit  510 F and the first ring unit  210 F in the wisdom ring puzzle  10 F. 
     [5-2. Method of Solving Wisdom Ring Puzzle  10 G (Part 1)] 
     A method  1000 G of solving the wisdom ring puzzle  10 G shown in  FIG.  17    will be described with reference to  FIG.  18    and  FIG.  19   . The wisdom ring puzzle  10 G is a puzzle targeting a state in which the lace  20 G is entangled only with the second pole  320 G (a state in which only the second pole  320 G exists at the inner side of the lace  20 G). 
     In the method of solving the wisdom ring puzzle  10 G, since the method up to the state of (A) of  FIG.  18    is the same as that of (A) of  FIG.  4    to (D) of  FIG.  4   , description thereof will be omitted. Also, the first structure body  200  in  FIG.  4    corresponds to a third structure  500 G in  FIG.  17   , the second structure body  300  in  FIG.  4    corresponds to a fourth structure  600 G in  FIG.  17   , and the third structure body  400  in  FIG.  4    corresponds to a first structure body  200 G and a second structure body  300 G in  FIG.  17   . The state of (A) of  FIG.  18    is a state in which the lace  20 G is entangled with the first pole  220 G (third pole  520 G) and the second pole  320 G. 
     As shown in (B) of  FIG.  18   , the tip  21 G of the lace  20 G passes through the inner side of the first ring unit  210 G in the direction D 1  (1), moves in the direction D 1  along the third pole  520 G, passes through the inner side of the third ring unit  510 G in the direction D 1  (2), and passes through the inner side of the fourth ring unit  610 G in the direction D 4  (3). That is, the lace  20 G hangs on the inner side of the fourth ring unit  610 G and hangs down in the direction D 2 . In this case, the lace  20 G in the vicinity of the tip  21 G is positioned at the outer side of the third ring unit  510 G. 
     As shown in (C) of  FIG.  18   , the tip  21 G of the lace  20 G moves in the direction D 1  along the third pole  520 G and the fourth pole  620 G, crosses over an uppermost portion of the fourth pole  620 G in the direction D 3  (4), moves in the direction D 2  along the fourth pole  620 G (5), and passes through the inner side of the third ring unit  510 G in the direction D 2  (6). 
     As shown in (D) of  FIG.  18   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 3  side) of the third ring unit  510 G in the direction D 1  (7), moves in the direction D 1  along the fourth pole  620 G, crosses over the uppermost portion of the fourth pole  620 G in the direction D 4  (8), moves in the direction D 2  along the fourth pole  620 G and the third pole  520 G, and passes through the inner side of the third ring unit  510 G in the direction D 2  (9). That is, the lace  20 G hangs on the inner side of the fourth ring unit  610 G and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 G. 
     As shown in (E) of  FIG.  18   , the tip  21 G of the lace  20 G passes through the inner side of the fourth ring unit  610 G in the direction D 3  (10), moves in the direction D 2  along the third pole  520 G, and passes through the inner side of the third ring unit  510 G in the direction D 2  (11). 
     As shown in (F) of  FIG.  18   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (12), moves in the direction D 1  along the third pole  520 G and the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 3  (13). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G (14) and passes through the inner side of the second ring unit  310 G in the direction D 3  (15). In this state, the lace  20 G in the vicinity of the tip  21 G is positioned at the outer side of the first ring unit  210 G. In addition, the lace  20 G sandwiches the first pole  220 G and the second pole  320 G. 
     As shown in (G) of  FIG.  18   , the tip  21 G of the lace  20 G crosses over the second ring unit  310 G in the direction D 4  (16), moves in the direction D 1  along the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 4  (17). Thereafter, the tip  21 G moves  18  in the direction D 2  along the fourth pole  620 G and the third pole  520 G (18), and crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 2  (19). In this state, the lace  20 G is wound around the second ring unit  310 G. 
     As shown in (H) of  FIG.  18   , the tip  21 G of the lace  20 G moves in the direction D 1  along the third pole  520 G, passes through the inner side of the third ring unit  510 G in the direction D 1  (20), passes through the inner side of the fourth ring unit  610 G in the direction D 4  (21), and passes through the inner side of the third ring unit  510 G in the direction D 2  (22). In this state, the lace  20 G hangs on the inner side of the fourth ring unit  610 G and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 G. 
     As shown in (A) of  FIG.  19   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (23), moves in the direction D 1  along the third pole  520 G and the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 3  (24). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G, crosses over the outer side (direction D 3  side) of the third ring unit  510 G, turns and passes through the inner side of the third ring unit  510 G in the direction D 1  (25). Thereafter, the tip  21 G moves in the direction D 1  along the fourth pole  620 G, crosses over the uppermost portion of the fourth pole  620 G in the direction D 4  (26), moves in the direction D 2  along the fourth pole  620 G and the third pole  520 G, and crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 2  (27). In this state, the lace  20 G hangs on the inner side of the fourth ring unit  610 G, and the lace  20 G in the vicinity of the tip  21 G is positioned at the outer side of the third ring unit  510 G. 
     As shown in (B) of  FIG.  19   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (28), passes through the inner side of the fourth ring unit  610 G in the direction D 3  (29), moves in the direction D 2  along the fourth pole  620 G, passes through the inner side of the third ring unit  510 G in the direction D 2  (30), and passes through the inner side of the first ring unit  210 G in the direction D 2  (31). 
     As shown in (C) of  FIG.  19   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the first ring unit  210 G in the direction D 1  (32), passes through the inner side of the third ring unit  510 G in the direction D 1  (33), moves in the direction D 1  along the third pole  520 G, passes through the inner side of the fourth ring unit  610 G in the direction D 4  (34), moves in the direction D 2  along the third pole  520 G, and crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 2  (35). 
     As shown in (D) of  FIG.  19   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (36), moves in the direction D 1  along the third pole  520 G and the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 3  (37). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G, passes through the inner side of the third ring unit  510 G in the direction D 2 , turns and crosses over the outer side (direction D 3  side) of the third ring unit  510 G in the direction D 1  (38). Thereafter, the tip  21 G moves in the direction D 1  along the fourth pole  620 G, crosses over the uppermost portion of the fourth pole  620 G in the direction D 4  (39), moves in the direction D 2  along the fourth pole  620 G and the third pole  520 G, and passes through the inner side of the third ring unit  510 G in the direction D 2  (40). In this state, the lace  20 G hangs on the inner side of the fourth ring unit  610 G and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 G. 
     As shown in (E) of  FIG.  19   , the tip  21 G of the lace  20 G passes through the inner side of the third ring unit  510 G in the direction D 1 , passes through the inner side of the fourth ring unit  610 G in the direction D 3  (41), moves in the direction D 2  along the third pole  520 G, and passes through the inner side of the third ring unit  510 G in the direction D 2  (42). In this state, the lace  20 G passes through the inner side of the first ring unit  210 G in the direction D 2  and is entangled with the third pole  520 G. 
     As shown in (F) of  FIG.  19   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (43), moves in the direction D 1  along the third pole  520 G and the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 3  (44). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G, crosses over the second ring unit  310 G in the direction D 3 , and crosses over the outer side (direction D 3  side) of the first ring unit  210 G in the direction D 2  (45). Thereafter, the tip  21 G turns and passes through the inner side of the first ring unit  210 G in the direction D 1  (46), passes through the inner side of the second ring unit  310 G in the direction D 4  (47), and passes through the inner side of the first ring unit  210 G in the direction D 2  (48), so that the lace  20 G is in a state of being entangled only with the second pole  320 G (a state in which the puzzle is solved). In this state, only the second pole  320 G exists at the inner side of the lace  20 G. 
     [5-3. Method of Solving Wisdom Ring Puzzle  10 G (Part 2)] 
     Another method  1000 G of solving the wisdom ring puzzle  10 G shown in  FIG.  17    will be described with reference to  FIG.  20    and  FIG.  21   . Unlike the method (Part 1) shown in  FIG.  18    and  FIG.  19   , the method (Part 2) shown in  FIG.  20    and  FIG.  21    starts with the lace  20 G not being entangled with any of the poles. 
     As shown in (A) of  FIG.  20   , the tip  21 G of the lace  20 G passes through the inner side of the first ring unit  210 G in the direction D 1  between the second pole  320 G and the first pole  220 G (the fourth pole  620 G) (1). Thereafter, the tip  21 G moves in the direction D 1  along the second pole  320 G, passes through the inner side of the second ring unit  310 G in the direction D 3  (2), moves in the direction D 2  along the second pole  320 G, and passes through the inner side of the first ring unit  210 G in the direction D 2 . 
     As shown in (B) of  FIG.  20   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 3  side) of the first ring unit  210 G in the direction D 1  (4), crosses over the second ring unit  310 G in the direction D 4  (5), moves in the direction D 1  along the fourth pole  620 G (6), and crosses over the uppermost portion of the fourth ring unit  610 G in the direction D 4  (7). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G and the third pole  520 G and crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 2  (8). In this state, the lace  20 G is wound around the second ring unit  310 G. 
     As shown in (C) of  FIG.  20   , the tip  21 G of the lace  20 G moves in the direction D 1  along the third pole  520 G, passes through the inner side of the third ring unit  510 G in the direction D 1  (9), passes through the inner side of the fourth ring unit  610 G in the direction D 4  (10), and passes through the inner side of the third ring unit  510 G in the direction D 2  (11). In this state, the lace  20 G hangs on the inner side of the fourth ring unit  610 G and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 G. 
     As shown in (D) of  FIG.  20   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (12), moves in the direction D 1  along the third pole  520 G and the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 3  (13). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G, crosses over the outer side (direction D 3  side) of the third ring unit  510 G in the direction D 2 , turns and passes through the inner side of the third ring unit  510 G in the direction D 1  (14). Thereafter, the tip  21 G moves in the direction D 1  along the fourth pole  620 G, crosses over the uppermost portion of the fourth pole  620 G in the direction D 4  (15), moves in the direction D 2  along the fourth pole  620 G and the third pole  520 G, moves in the direction D 2  along the fourth pole  620 G and the third pole  520 G, and crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 2  (16). In this state, the lace  20 G hangs on the inner side of the fourth ring unit  610 G, and the lace  20 G in the vicinity of the tip  21 G is positioned at the outer side of the third ring unit  510 G. 
     As shown in (E) of  FIG.  20   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (17), passes through the inner side of the fourth ring unit  610 G in the direction D 3  (18), moves in the direction D 2  along the fourth pole  620 G, passes through the inner side of the third ring unit  510 G in the direction D 2  (19), and crosses over the outer side (direction D 4  side) of the first ring unit  210 G in the direction D 2  (20). 
     As shown in (F) of  FIG.  20   , the tip  21 G of the lace  20 G turns after crossing over the outer side of the first ring unit  210 G in the direction D 2  (21), passes through the inner side of the first ring unit  210 G in the direction D 1  (21), passes through the inner side of the third ring unit  510 G in the direction D 1  (22), moves in the direction D 1  along the third pole  520 G, passes through the inner side of the fourth ring unit  610 G in the direction D 4  (23), moves in the direction D 2  along the third pole  520 G, and crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 2  (24). 
     As shown in (G) of  FIG.  20   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (25), moves in the direction D 1  along the third pole  520 G and the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 3  (26). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G, passes through the inner side of the third ring unit  510 G in the direction D 2 , turns and crosses over the outer side (direction D 3  side) of the third ring unit  510 G in the direction D 1  (27). Thereafter, the tip  21 G moves in the direction D 1  along the fourth pole  620 G, crosses over the uppermost portion of the fourth pole  620 G in the direction D 4  (28), moves in the direction D 2  along the fourth pole  620 G and the third pole  520 G, and passes through the inner side of the third ring unit  510 G in the direction D 2  (29). In this state, the lace  20 G hangs on the inner side of the fourth ring unit  610 G and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 G. 
     As shown in (H) of  FIG.  20   , the tip  21 G of the lace  20 G passes through the inner side of the third ring unit  510 G in the direction D 1 , passes through the inner side of the fourth ring unit  610 G in the direction D 3  (30), moves in the direction D 2  along the third pole  520 G, and passes through the inner side of the third ring unit  510 G in the direction D 2  (31). In this state, the lace  20 G crosses over the outer side of the first ring unit  210 G and is entangled with the third pole  520 G. 
     As shown in (A) of  FIG.  21   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (32), moves in the direction D 1  along the third pole  520 G and the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 3  (33). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G and crosses over the second ring unit  310 G in the direction D 3  (34). In this state, the lace  20 G in the vicinity of the tip  21 G is positioned at the outer side of the first ring unit  210 G. Further, the lace  20 G sandwiches the first pole  220 G. 
     As shown in (B) of  FIG.  21   , the tip  21 G of the lace  20 G passes through the inner side of the second ring unit  310 G in the direction D 4  (35), moves in the direction D 1  along the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 4  (36). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G and the third pole  520 G and crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 2  (37). 
     As shown in (C) of  FIG.  21   , the tip  21 G of the lace  20 G moves in the direction D 1  along the third pole  520 G, passes through the inner side of the third ring unit  510 G in the direction D 1  (38), passes through the inner side of the fourth ring unit  610 G in the direction D 4  (39), and passes through the inner side of the third ring unit  510 G in the direction D 2  (40). In this state, the lace  20 G hangs on the inner side of the fourth ring unit  610 G and hangs down in the direction D 2  so as to pass through the inner side of the third ring unit  510 G. 
     As shown in (D) of  FIG.  21   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (41), moves in the direction D 1  along the third pole  520 G and the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 3  (42). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G, crosses over the outer side (direction D 3  side) of the third ring unit  510 G in the direction D 2 , turns and passes through the inner side of the third ring unit  510 G in the direction D 1  (43). Thereafter, the tip  21 G moves in the direction D 1  along the fourth pole  620 G, crosses over the uppermost portion of the fourth pole  620 G in the direction D 4  (44), moves in the direction D 2  along the fourth pole  620 G and the third pole  520 G, and crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 2  (45). In this state, the lace  20 G hangs on the inner side of the fourth ring unit  610 G, and the lace  20 G in the vicinity of the tip  21 G is positioned at the outer side of the third ring unit  510 G. 
     As shown in (E) of  FIG.  21   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (46), passes through the inner side of the fourth ring unit  610 G in the direction D 3  (47), moves in the direction D 2  along the fourth pole  620 G, passes through the inner side of the third ring unit  510 G in the direction D 2  (48), and passes through the inner side of the first ring unit  210 G in the direction D 2  (49). In this state, the lace  20 G is entangled only with the first pole  220 G (the fourth pole  620 G). 
     As shown in (F) of  FIG.  21   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the first ring unit  210 G in the direction D 1  (50), passes through the inner side of the third ring unit  510 G in the direction D 1  (51), moves in the direction D 1  along the third pole  520 G, passes through the inner side of the fourth ring unit  610 G in the direction D 4  (52), moves in the direction D 2  along the third pole  520 G, and crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 2  (53). 
     As shown in (G) of  FIG.  21   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (54), moves in the direction D 1  along the third pole  520 G and the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 3  (55). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G, passes through the inner side of the third ring unit  510 G in the direction D 2 , turns and crosses over the outer side (direction D 3  side) of the third ring unit  510 G in the direction D 1  (56). Thereafter, the tip  21 G moves in the direction D 1  along the fourth pole  620 G, crosses over the uppermost portion of the fourth pole  620 G in the direction D 4  (57), moves in the direction D 2  along the fourth pole  620 G and the third pole  520 G, and crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 2  (58). In this state, the lace  20 G is entangled with the first pole  220 G (the fourth pole  620 G) and the third pole  520 G. 
     As shown in (H) of  FIG.  21   , the tip  21 G of the lace  20 G crosses over the outer side (direction D 4  side) of the third ring unit  510 G in the direction D 1  (59), moves in the direction D 1  along the third pole  520 G and the fourth pole  620 G, and crosses over the uppermost portion of the fourth pole  620 G in the direction D 3  (60). Thereafter, the tip  21 G moves in the direction D 2  along the fourth pole  620 G, crosses over the second ring unit  310 G in the direction D 3 , and crosses over the outer side (direction D 3  side) of the first ring unit  210 G in the direction D 2  (61), so that the lace  20 G is in a state of being entangled only with the second pole  320 G (a state in which the puzzle is solved). In this state, only the second pole  320 G exists at the inner side of the lace  20 G. 
     6. Sixth Embodiment 
     Wisdom ring puzzles  10 H and  10 J according to the sixth embodiment will be described with reference to  FIG.  22 A .  FIG.  22 A  is a diagram illustrating a structure of a wisdom ring puzzle according to an embodiment of the present invention. As in the first to fifth embodiments, the wisdom ring puzzles  10 H and  10 J are puzzles using laces  20 H and  20 J. The player enjoys the wisdom ring puzzles  10 H and  10 J by entangling the laces  20 H and  20 J with poles (for example, a first pole  220 H and a second pole  320 J) arranged on the wisdom ring puzzles  10 H and  10 J or by removing the laces  20 H and  20 J from the poles. 
     The wisdom ring puzzle  10 H in  FIG.  22 A  is similar to the wisdom ring puzzle  10  in  FIG.  1 A , and the wisdom ring puzzle  10 J in  FIG.  22 B  is similar to the wisdom ring puzzle  10 A in  FIG.  1 B . In the following description, the description of the configuration similar to that of the wisdom ring puzzles  10  and  10 A of the first embodiment will be omitted. In the following description, in the case of describing the same configuration as that of the wisdom ring puzzle  10  among the wisdom ring puzzle  10 H, the description thereof may be omitted by adding the letter “H” after the symbols shown in  FIG.  1 A . Further, in the case of describing the same configuration as the wisdom ring puzzle  10 A among the wisdom ring puzzle  10 J, the description may be omitted by adding “J” instead of the letter “A” after the symbols shown in  FIG.  1 B . 
     [6-1. Structure of Wisdom Ring Puzzle  10 H] 
     As shown in  FIG.  22 A , the wisdom ring puzzle  10 H includes a stage  100 H, a first structure body  200 H, and a second structure body  300 H. 
     The first ring unit  210 H is positioned in the direction D 1  with respect to the stage  100 H. The second ring unit  310 H is positioned in the direction D 1  with respect to the first ring unit  210 H. As described above, in the present embodiment, the first virtual plane on which the first ring unit  210 H is arranged is substantially parallel to an upper surface  101 H, and the second virtual plane on which the second ring unit  310 H is arranged is substantially orthogonal to the upper surface  101 H. However, the present invention is not limited to the above configuration. For example, the angle formed by the upper surface  101 H and the first virtual plane may be smaller than the angle formed by the upper surface  101 H and the second virtual plane. 
     The first pole  220 H extends from a connection part with the first ring unit  210 H in the direction D 1 , passes through the inner side of the second ring unit  310 H, passes through the inner side of the first ring unit  210 H in the direction D 2 , and is connected to the stage  100 H. In a plan view, the first pole  220 H extends in the direction D 3  from the connection part with the first ring unit  210 H, passes through the inner side of the second ring unit  310 H, and is connected to the stage  100 H at the inner side of the first ring unit  210 H. The second pole  320 H extends from the second ring unit  310 H in the direction D 2 , passes through the inner side of the first ring unit  210 H, and is connected to the stage  100 H. 
     [6-2. Structure of Wisdom Ring Puzzle  10 J] 
     As shown in  FIG.  22 B , the wisdom ring puzzle  10 J includes a stage  100 J, a first structure body  200 J, and a second structure body  300 J. 
     The second pole  320 J extends in the direction D 1  from an end portion of the second ring unit  310 J in the direction D 1 , turns and extends in the direction D 2 . The second pole  320 J extending in the direction D 2  passes through the inner side of the first ring unit  210 J and reaches the stage  100 J. In a plan view, the second pole  320 J extends in the direction D 3  from a connection part with the second ring unit  310 J and is connected to the stage  100 J at a position crossing over the first pole  220 J and at the inner side of the first ring unit  210 J. 
     The wisdom ring puzzle  10 H shown in  FIG.  22 A  corresponds to a configuration in which the third structure body  400  is omitted from the wisdom ring puzzle  10  shown in  FIG.  1 A . The wisdom ring puzzle  10 J shown in  FIG.  22 B  corresponds to a configuration in which the third structure body  400 A is omitted from the wisdom ring puzzle  10 A of  FIG.  1 B . 
     [6-3. Method of Solving Wisdom Ring Puzzle  10 H] 
     A method of solving the wisdom ring puzzle  10 H shown in  FIG.  22 A  is similar to the method of solving the wisdom ring puzzle  10  shown in  FIG.  1 A . For example, the wisdom ring puzzle  10 H can be solved in the same manner as in (A) of  FIG.  2    to (D) of  FIG.  2   , or in the same manner as in (A) of  FIG.  3    to (D) of  FIG.  3   . 
     [6-4. Method of Solving Wisdom Ring Puzzle  10 J] 
     The method of solving the wisdom ring puzzle  10 J shown in  FIG.  22 B  is similar to the method of solving the wisdom ring puzzle  10 A shown in  FIG.  1 B . For example, the wisdom ring puzzle  10 J can be solved in the same manner as in (A) of  FIG.  4    to (D) of  FIG.  4   , or in the same manner as in (A) of  FIG.  5    to (E) of  FIG.  5   . 
     7. Comparative Example (Structure which does not Work as Wisdom Ring Puzzle) 
     A comparative example 1100 with respect to the present embodiment will be described with reference to  FIG.  23   .  FIG.  23    is a diagram showing a structure of a wisdom ring puzzle in a comparative example. Although the configuration shown as a comparative example in  FIG.  23    is similar to the configurations of the first to sixth embodiments described above, the configuration does not work as a wisdom ring puzzle. 
     Although a structure body  30 V shown in (A) of  FIG.  23    is similar to the wisdom ring puzzle  10 H of  FIG.  22 A , it is different from the wisdom ring puzzle  10 H in that a first pole  220 V is connected to a stage  100 V crossing over the outer side of a first ring unit  210 V without passing through the inner side of the first ring unit  210 V. The structure body  30 V does not work as a wisdom ring puzzle because a sealed space is formed by a first structure body  200 V and a second structure body  300 V. 
     Although structure bodies  30 W and  30 X shown in (B) of  FIG.  23    and (C) of  FIG.  23    are similar to the wisdom ring puzzle  10 J of  FIG.  22 B , they are different from the wisdom ring puzzle  10 J in that second poles  320 W and  320 X cross over the outer side of the first ring unit  210  and are connected to stages  100 W and  100 X without passing through the inner side of first ring units  210 W and  210 X. The structure bodies  30 W and  30 X do not work as a wisdom ring puzzle because a sealed space is formed by first structure bodies  200 W and  200 X and second structure bodies  300 W and  300 X. 
     Although a structure body  30 Y shown in (D) of  FIG.  23    is similar to the wisdom ring puzzle  10  of  FIG.  1 A , it is different from the wisdom ring puzzle  10  in that a member passing through the inner side of a third ring unit  410 Y is not a first pole  220 Y between a first ring  210 Y and a stage  100 Y but the first pole  220 Y between a connection part between the first ring unit  210 Y and the first pole  220 Y and second ring unit  310 Y. The structure body  30 Y does not work as a wisdom ring puzzle because a sealed space is formed by a first structure body  200 Y, a second structure body  300 Y, and a third structure body  400 Y. 
     Although a structure body  30 Z shown in (E) of  FIG.  23    is similar to the wisdom ring puzzle  10 A of  FIG.  1 B , it is different from the wisdom ring puzzle  10 A in that a member passing through the inner side of a third ring unit  410 Z is not a first pole  220 Z between a first ring  210 Z and a stage  100 Z but the first pole  220 Z between a connection part between a second ring  310 Z and a second pole  320 Z and the first ring  220 Z. The structure body  30 Z does not work as a wisdom ring puzzle because a sealed space is formed by a first structure body  200 Z, a second structure body  300 Z, and a third structure body  400 Z. 
     The method of solving the wisdom ring puzzle shown in the above-described embodiment is merely an example, and there are various methods other than the above. 
     Each of the embodiments described above as the embodiment of the present invention can be appropriately combined as long as no contradiction is caused. Further, the addition, deletion, or design change of components, or the addition, deletion, or condition change of process as appropriate by those skilled in the art based on each embodiment are also included in the scope of the present invention as long as they are provided with the gist of the present invention. 
     Further, it is understood that, even if the effect is different from those provided by each of the above-described embodiments, the effect obvious from the description in the specification or easily predicted by persons ordinarily skilled in the art is apparently derived from the present invention. 
     According to an embodiment of the present invention, it is possible to provide a wisdom ring puzzle capable of sustaining the interest and motivation of a player to create a solution.