# Patent

## Title
Slot machine with synchronized spinning reels

## Abstract

A slot machine that can spin two or more of the reels in unison. Thus, the machine can spin and stop the reels in a standard fashion. If a special trigger occurs, then two or more reels can further spin with an identical offset. The further spin can generate additional rewards for the player.

## Background
All three U.S. application Ser. Nos. 11/612,841, 11/180,965, and 13/602,298 are all incorporated by reference herein in their entireties.
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention is directed to a method, apparatus, and computer readable storage medium directed to a slot machine that can spin with two or more reels locked in a simultaneous spin position.
Description of the Related Art
Slot machines are a billion dollar industry, both in the U.S. and around the world. Slot manufacturers are constantly seeking to improve their games with proprietary inventions, and these manufacturers can often derive substantial revenues if a proprietary game method becomes commercially successful. For example, U.S. Pat. No. 4,448,419 issued to Telnaes addresses a method for spinning slot machine reels. This invention was subsequently purchased by IGT and formed the basis for IGT's market dominance in the electromechanical slot machine industry for the past 20 years.
The majority of slot machines spin three reels independently in the same direction around a common axis. However, some games have incorporated novel methods of reel spinning. For example, a game called “Haywire” allows the reels to spin backwards and forwards like the machine is “broken” for a period of time. In “Balloon Bars” or “Double Diamond Deluxe,” when a reel stops with a certain directional symbol either just above or below the payline, it will sometimes rotate downward or upward one step to rest on the payline. This is called a “nudge.”
What is needed is a method for spinning the reels of a slot machine that is new and more exciting than prior art slot machines.
SUMMARY OF THE INVENTION
It is an aspect of the present invention to provide flexibility and innovations in spinning reels for a slot machine.
The above aspects can be obtained by a method that includes (a) determining an initial symbol stop on reel A, an initial symbol stop on reel B, and an initial symbol stop on reel C; (b) spinning reel A to stop on the initial symbol stop on reel A, spinning reel B to stop on the initial symbol stop on reel B, spinning reel C to stop on the initial symbol stop on reel C; (c) awarding the player a payout level based on the initial symbol stop on reel A and the initial symbol stop on reel B and the initial symbol stop on reel C; (d) if the initial symbol stop on reel A and the initial reel stop on reel B and the initial reel stop on reel C comprise a predetermined combination then performing the following: (e) moving reel A an offset number of symbols in a direction to stop on a final reel A stop; and (f) moving reel B the offset number of symbols in the direction to stop on a final reel B stop.
The above aspects can also be obtained by a method that includes (a) spinning a plurality of reels on the slot machine to form an initial reel combination; (b) triggering a special mode based on the initial reel combination; and (c) spinning and stopping two or more of the plurality of reels with an identical offset from the initial reel combination to form a final combination.
The above aspects can also be obtained by an apparatus that includes (a) a first spinning unit spinning a plurality of reels on the slot machine apparatus to form an initial reel combination; (b) a triggering unit triggering a special mode based on the initial reel combination; and (c) a second spinning unit spinning and stopping two or more of the plurality of reels with an identical offset from the initial reel combination to form a final combination.
These together with other aspects and advantages which will be subsequently apparent, reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout.



BRIEF DESCRIPTION OF THE DRAWINGS
Further features and advantages of the present invention, as well as the structure and operation of various embodiments of the present invention, will become apparent and more readily appreciated from the following description of the preferred embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flowchart illustrating an exemplary method of triggering and implementing a synchronized reel spin mode, according to an embodiment; and
FIG. 2 is a flowchart illustrating an exemplary method of mapping a reel outcome, according to an embodiment.



DESCRIPTION OF THE PREFERRED EMBODIMENTS
Reference will now be made in detail to the presently preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
The present inventive concept relates to a method, apparatus, and computer readable storage to trigger (optionally) and conduct a slot machine spin with reels that can spin synchronously. A synchronous spin (or “lockdown” mode/spin) can be considered a spin in which two or more vertical reels of a slot machine can move in unison, e.g. a same number of symbols are displaced for each reel (“an offset”). The offset can be a random number. Instead of triggering an instant lockdown spin (to be discussed herein), a lockdown spin can also be earned and “banked” for use on a later spin or saved for the next 3-symbol combination (or other trigger). When a lockdown spin is triggered, the player may be prompted that he or she has earned a lockdown spin and should press a button to generate the spin, or the lockdown spin can occur automatically (with or without a delay after the initial spin).
A typical 3-reel slot machine may have 22 physical stops on each real, each alternating symbol-blank-symbol-blank-etc. When a lockdown spin is performed when there are three symbols already on the payline, the value of the lockdown spin is greater than the value of a random spin. When a lockdown is triggered by having three symbols on the payline, the resulting payline will typically be either all three symbols or all three blanks.
Table I below illustrates an exemplary reel mapping for a two reel slot machine (reel A and reel B). It is noted that reel A does not necessarily correspond to the leftmost reel and that reel B does not necessarily correspond to the rightmost reel (e.g. reel A can be the rightmost reel and reel B can be the leftmost reel).









TABLE I





reel stop
reel A symbol
reel B Symbol







1
cherry
cherry


2
blank
blank


3
cherry
cherry


4
blank
blank


5
bar
bar


6
blank
blank









Note that the reels in Table I are identical (although they don't have to be), and are not weighted (although of course they can be). Note that the reel alternates with symbol/blank/symbol/blank/symbol/blank.
Table II below illustrates a sample payout of this two-reel machine.












TABLE II







combination
payout
probability
contribution





















cherry/cherry
 1
1/9 
.1111



bar/bar
50
1/64
.78125



cherry/bar
 0
1/24
0



bar/cherry
 0
1/24
0



overall


.89235










The expected return of the game exemplified in Tables I and II is 89.235%. This assumes there is no lockdown functionality. In this example, we will add a lockdown mode, and specify that the trigger in this case will be achieving all symbols on the payline but on a non-paying combination. The trigger can also be all symbols on the payline which includes paying combinations, any other trigger described herein, or any other combination of symbols can be used as a trigger.
Thus, in this example, the trigger will be achieving the cherry/bar or bar/cherry combinations. Thus, the lockdown spin in this example can be considered a consolation prize for achieving all symbols on the payline but no winning combination. The probability of triggering a lockdown spin in this example is 1/12. There are four possible lockdown combinations, depending on whether the player gets symbols: 1/5; 3/5; 5/1; 5/3. Once the lockdown mode is triggered, then the four possible “locked down” reel configurations are illustrated in Tables IIIa, IIIb, IIIc, and IIId, respectively.










TABLE IIIa





reel stop
reel A symbol
reel B Symbol
payout







1
cherry
bar



2
blank
blank



3
cherry
cherry
1


4
blank
blank



5
bar
cherry



6
blank
blank



















TABLE IIIb





reel stop
reel A symbol
reel B Symbol
payout







1
cherry
cherry
1


2
blank
blank



3
cherry
bar



4
blank
blank



5
bar
cherry



6
blank
blank



















TABLE IIIc





reel stop
reel A symbol
reel B Symbol
payout







1
cherry
cherry
1


2
blank
blank



3
cherry
bar



4
blank
blank



5
bar
cherry



6
blank
blank



















TABLE IIId





reel stop
reel A symbol
reel B Symbol
payout







1
cherry
bar



2
blank
blank



3
cherry
cherry
1


4
blank
blank



5
bar
cherry



6
blank
blank









Note that in Tables Ma, IIIb, IIIc, and IIId, the reels are all aligned to be symbol/symbol or blank/blank. Thus, a single random spin of the reels synchronously may typically result in a higher hit frequency than a random spin of the individual reels (although this is not required), and a single random spin of the reels synchronously may result in a higher expected value than a random spin (although this is not required). The single random spin of the reels synchronously when non-paying symbols are aligned in the above example results in a higher hit frequency than a standard spin but a lower expected value for the spin. With a typical 3-reel configuration of 22 stops, a lockdown spin would preferably (although not required) have both a higher hit frequency and a higher expected value.
An additional lockdown spin as described above is worth 1/6 (or 0.16667). The probability of a lockdown spin as described above is 1/12. With the addition of the bonus single lockdown spin that pays once after being triggered by two non-paying symbols as in the above example, this results in an additional (1/6*1/12) or 0.0138 in additional return for the player (in addition to the base game of 0.89235). The reels on a three reel game may be designed such that a lockdown spin increases the chances of the player hitting a large payout (e.g. a 7-7-7).
Table IV below illustrates another exemplary reel mapping for a two reel slot machine (reel A and reel B). It is noted that reel A does not necessarily correspond to the leftmost reel and that reel B does not necessarily correspond to the rightmost reel (e.g. reel A can be the rightmost reel and reel B can be the leftmost reel).









TABLE IV





reel stop
reel A symbol
reel B Symbol







1
7
cherry


2
blank
blank


3
7
blank


4
blank
blank


5
blank
synchronous


6
blank
7


7
blank
blank


8
synchronous
blank









The synchronous symbol (stop 8 on reel A and stop 5 on reel B) can be a special symbol used to trigger a special synchronous mode (also can be called a simultaneous reel spin mode, a unison mode, etc.), which can cycle through some or all offsets of reel A and reel B after the synchronous mode is triggered. A synchronous symbol may also be wild, or otherwise substitute for one or more other symbols to activate a winning award combination.
Table V illustrates one exemplary paytable to illustrate an embodiment of the present inventive concept.










TABLE V







combination
payout



















blank/blank
0



any/cherry
1



7/7
15



synchronous/synchronous
initiate synchronous spin










When the synchronous mode is triggered (in this example by getting two synchronous symbols, although any other triggering conditions can be used as well), Table VI illustrates the possible combinations generated by cycling through all offsets of reel A and reel B (after the synchronous mode was triggered wherein reel A was at stop 8 and reel B was at stop 5).










TABLE VI





synchronous combination #
reel A symbol
reel B Symbol
payout


















1
7
7
15


2
blank
blank
0


3
7
blank
0


4
blank
cherry
1


5
blank
blank
0


6
blank
blank
0


7
blank
blank
0


8
synchronous
synchronous
n/a









Thus, by earning a synchronous mode which in this example rotates reel A and reel B simultaneously through all stops results in two winning combinations: 7/7 and blank/cherry, for a total win of 16 using Table V.
Table VII below illustrates the effective payouts which include the synchronous mode (this is the same as Table V but with the value of the synchronous/synchronous combination included).










TABLE VII







combination
payout



















blank/blank
0



any/cherry
1



7/7
15



synchronous/synchronous
16










Table VIII below illustrates the payout distribution for the reel mapping and paytable illustrated in Tables IV and V.










TABLE VIII





winning payout
probability
payout
contribution


















any/cherry
1/8 
1
.125


7/7
1/32
15
.46875


synchronous/synchronous
1/64
16
.25


total
n/a
n/a
.84375









The example above relates to a two reel game each with 8 non-weighted symbol stops, wherein the synchronous mode is earned by achieving two synchronous symbols, and the synchronous mode cycles the reels through all reel stops and awards prizes for each. Of course, this is just one example, and the methods described herein can be applied to games of any number of reels (e.g. 3, 5, etc.), any number of reel stops, weighted symbol stops, and any other parameters known for slot machine games. The synchronous mode can trigger a number of actions involving rotating two or more reels simultaneously. For example, the synchronous mode can simply respin two or more symbols in unison once.
The synchronous mode can be triggered in a number of ways: 1, 2, or more synchronous symbols can appear on a payline; a payline can have a predetermined number (including all) of non-blank symbols, a payline can have a predetermined number (including all) blanks, etc. The synchronous mode can also occur after each initial spin without a special conditional trigger.
Further examples of synchronous triggers/mode are as follows: A machine can have synchronous symbols on its reels, and when one or more reels displays a synchronous symbol, the synchronous mode is triggered which cause the reels without the synchronous symbol to remain stationary and spins the reel(s) with the synchronous symbol in the synchronous mode (if only one reel has the synchronous symbol then the synchronous mode may not be triggered or this reel can be spun on its own). The synchronous spin can occur once or can cycle through more than one (or perhaps all the symbol stops on a reel), paying on each winning combination. If three reels on a three reel machine result in the synchronous symbol, then all three reels can be “locked” and spun in unison (as described herein); optionally, before spinning all three reels in a synchronous mode, the reels can be respun once first and then the synchronous mode can be triggered.
Alternatively, a single synchronous symbol appearing on any of the reels may trigger a synchronous mode (including but not limited to any of the ones described herein). Further, a synchronous mode can be triggered without using special symbols but based on symbols already present on the machine or based on an attribute (hidden or visible) of symbols already present on the machine. For example, if the player gets three symbols (e.g. no blanks) on a payline (and no winning payout, or alternatively including a winning payout), then a synchronous mode can be triggered. Alternatively, if the player gets three (or any number of) blanks, a synchronous mode can be triggered. Alternatively, if the player gets a predetermined combinations (e.g. two 7's), a synchronous mode can be triggered. Certain particular symbols on a reel or reels (e.g. one or more particular 7's [or any symbol]) can trigger the synchronous mode, even though all such symbols on the reels may not trigger the synchronous mode.
A further example of an embodiment of the general inventive concept will be presented. Table IX represents another exemplary reel mapping for a two-reel machine with eight stops.









TABLE IX





#
Reel A
Reel B







1
cherry
Bar


2
blank
Blank


3
bar
Bar


4
blank
Blank


5
seven
seven


6
blank
Blank


7
bar
seven


8
blank
Blank









Table X below illustrates the frequency of each symbol for each real and the probability of occurrence for each reel. Note that in this example the symbols are non-weights (although weights can be used).











TABLE X





Symbol
freq. A
freq. B
prob. A
prob. B



















Cherry
1
0
0.125
0


bar
2
2
0.25
0.25


seven
1
2
0.125
0.25


blank
4
4
0.5
0.5


total
8
8









Table XI below illustrates combinations of reel A and reel B, a exemplary payout, the probability and contribution of each respective payout, overall hit frequency, and overall return.












TABLE XI









overall hit



Combination
payout
prob
contrib
frequency
0.21875




















cherry/any
1
0.125
0.125




bar/bar
4
0.0625
0.25




seven/seven
15
0.03125
0.46875




bar/seven
0
0.0625
0




seven/bar
0
0.03125
0




blank/bar
0
0.125
0




blank/seven
0
0.125
0




bar/blank
0
0.125
0




seven/blank
0
0.0625
0




blank/blank
0
0.25
0






1
0.84375
overall return









In this example, the synchronous mode is triggered on a bar/seven or seven/bar combination (of course any other combination can be used to trigger the synchronous mode as well). The probability of hitting a bar/seven or a seven/bar is 0.09375.
Once a synchronous mode is triggered, in this example there are four possible layouts for the synchronous spins. For example, the synchronous mode can be triggered if the first symbol (reel A) is stop number 3 (bar) and the second symbol (reel B) is stop number 5 (seven). Then the reels are aligned as illustrated in Table XII.










TABLE XII









p(trigger this
 0.015625 pay



layout)












cherry
bar
 1



blank
blank
 0



bar
seven
 0



blank
blank
 0



seven
seven
15



blank
blank
 0



bar
bar
 4



blank
blank
 0
















total
0.039063





 2.5
contrib







hit
0.375






frequency










If the synchronous mode is triggered with the first symbol (reel A) is stop number 5 (seven) and the second symbol (reel B) is stop number 1 (bar), then the reels are aligned as illustrated in Table XIII. This layout can also be triggered with the first symbol (reel A) is stop number 3 (bar) and the second symbol (reel B) is stop number 7 (seven).










TABLE XIII









p(trigger
0.03125 pay



this layout 












cherry
seven
1



blank
blank
0



bar
seven
0



blank
blank
0



seven
bar
0



blank
blank
0



bar
bar
4



blank
blank
0
















Total
0.019531





0.625
contrib







Hit
0.25






frequency










If the synchronous mode is triggered with the first symbol (reel A) is stop number 5 (seven) and the second symbol (reel B) is stop number 3 (bar), then the reels are aligned as illustrated in Table XIV. This layout can also be triggered with the first symbol (reel A) is stop number 7 (bar) and the second symbol (reel B) is stop number 5 (seven).










TABLE XIV









p(trigger this layout
0.03125











Cherry
seven
1



Blank
blank
0



Bar
bar
4



Blank
blank
0



Seven
bar
0



Blank
blank
0



Bar
seven
0



Blank
blank
0















0.625
total
0.019531






contrib







hit
0.25






frequency










If the synchronous mode is triggered with the first symbol (reel A) is stop number 7 (bar) and the second symbol (reel B) is stop number 7 (seven), then the reels are aligned as illustrated in Table XV.










TABLE XV







p(trigger this layout
0.015625













cherry
bar
1




blank
blank
0




bar
bar
4




blank
blank
0




seven
seven
15




blank
blank
0




bar
seven
0




blank
blank
0






2.5
total
0.039063





contrib






hit
0.375





frequency









Table XVI below is table identifying the total synchronous contribution to the overall return of the machine, the average synchronous spin return, the total return of the machine including the synchronous contribution, and the average synchronous spin hit frequency.









TABLE XVI








total synchronous contribution
.117188



average synchronous spin return
1.25



total return + synchronous contribution
.960938



average synchronous spin hit frequency
.291667









Note that the synchronous spin hit frequency is higher than the overall hit frequency of the machine in a standard (non-synchronous spin) mode. Note that the expected return of a synchronous spin is also higher than the return of a spin in the standard mode.
When in the synchronous mode, if the resulting combination is also a synchronous mode trigger, then either the synchronous spin can end and play stops or another synchronous spin can be triggered.
FIG. 1 is a flowchart illustrating an exemplary method of triggering and implementing a synchronized reel spin mode, according to an embodiment.
The method can start with operation 100, which determines an initial combination of the reels after a spin, and performs the spin. The spin can stop at the initial combination. This is done as described herein or as known in the art. A payout level can be determined based on the initial combination. For example, if the initial combination does not comprise a winning combination then the payout level is zero. If the initial combination of the spin is a combination that pays 10 coins, then the payout level is 10. The player can be paid the payout level for the initial combination.
From operation 100, the method proceeds to operation 102, which determines whether the initial combination from operation 100 triggers a synchronous mode spin. The triggering condition can be chosen by the particular game and can be any of the triggering conditions described herein or as known in the art. The condition can also be a purely random determination as well (e.g. regardless of the result of the spin). If a synchronous spin is not triggered, then the method can proceed to operation 112 which ends the game and so the player can start a new game.
From operation 102, if a synchronous spin is triggered, then the method can proceed to operation 104, which identifies which reels to spin synchronously. This may be done based on the result of the spin from operation 100 and rules of the particular game. For example, the rules can trigger a synchronous spin when two or more reels have a synchronous spin symbol, or alternatively any other subset or reels, including all reels. The reels to spin synchronously may (but not required to be) be the reels that display a synchronous symbol. A synchronous symbol may also be present on less than all the reels, for example just the last reel. Thus a lockdown spin (or spins) can be triggered if the last reel displays a synchronous symbol, or a lockdown spin (or spins) can be triggered if the last reel displays a synchronous symbol with the other reels displaying a particular subset of symbols (such as any non-blank symbol). The synchronous symbol may or may not be wild. A spin can result in a paying combination and also a subsequent lockdown spin(s), or a spin may result in a non-paying combination but a lockdown spin(s), or of a paying combination but no lockdown spin(s).
From operation 104, the method can proceed to operation 106, which can determine an offset to spin the reels identified in operation 102. The offset can be determined according to the design choices of the particular game. For example, the offset can be a random number (e.g. from 1 to the number of reel stops on the symbols).
From operation 106, the method can proceed to operation 108, which performs a synchronous spin (e.g. spins the reels the offset number of symbols determined in operation 106). There may be a delay after the reels are stopped at the initial combination before the synchronous spin so that the player can appreciate the machine is now in a synchronous spin mode. Flashing lights, sounds, and any visual and/or audible indicators can be used to excite the player that he or she has earned a synchronous spin. In order to enhance the visual effect to the player, the reels can optionally be spun in a “slow motion” mode. A controller for a slot machine may issue a signal to the motor of each reel designating a speed and a symbol to stop at. For example, of the synchronous mode is triggered, and the synchronous spin is to spin the first reel and the second reel ten symbols ahead. The first reel and the second reel can be spun slowly symbol by symbol until the ten symbols pass upon which the reels can stop. In this way, the player can appreciate the fact that the reels are spinning synchronously. As described herein, as the reels spin in slow motion, awards can be generated based upon each (or some) intermediate set of symbols displayed, or awards can be generated based only the final symbols when the synchronous mode stops. When the synchronous mode is over and the reel(s) stop spinning, then the reels are now in a final combination.
From operation 108, the method can proceed to operation 110, wherein the machine determines (and pays) a payout level of the final combination. If the payout level of the final combination is greater than zero, then the player can be paid the payout level. Payout levels of the final combination may be the same (or may not be) as the payout levels of the initial combination. In other words, the payouts may be the same as if the player hit a winning combination initially, or the payouts may be different (e.g. greater or smaller).
It is noted that the operations in FIG. 1 can be performed in any sensible order. Typically, a slot machine determines an outcome of the spin as soon as the spin is commenced, and the spinning (and other action) of the machine is just for “show.” A machine may determine the initial combination, whether the synchronous mode is triggered, and the final combination all before they actually occur to the player.
After a trigger, a lockdown spin can be performed just once (with a predetermined or random offset), or any number of times, paying on each lockdown spin. A lockdown spin can also use an offset of one and can be performed repeatedly. Alternatively, a lockdown spin can use an initial random offset, then performed repeated lockdown spins with an offset of one (or other number such as two). In this way, the player gets a lockdown spin with a random offset and then can also get further synchronous spins with identical offsets on each reel spinning in the lockdown mode.
In a further embodiment, a synchronous mode can also shift the symbols left or right, and replace the empty column of symbols with newly generated random symbols (or symbols from an additional reel not visible until the synchronous mode is triggered).
In another embodiment, if the player achieves all non-blank symbols on a payline, this can trigger the synchronous mode. If a game is uses weighted reels, the synchronous mode may or may not use weights when spinning the reels in the synchronous mode.
Slot machines can determine outcomes by choosing random symbol stops on each reel, and then displaying the chosen symbol stops on the reels. For example, on a 3 reel machine with 22 symbol stops, 3 random numbers can be chosen from 1-22 for each reel. After the numbers are chosen, the reels can be spun, and the results can be displayed.
An issue with this methodology is that it may be undesirable to have blanks appear, especially in the first column. The Telnaes patent addressed this issue by weighting reels, such that each symbol did not have an equal probability of being displayed on a payline.
A further method of eliminating blanks may be by determining the result of a spin, and then modifying the result, and then displaying the modified result. For example, a machine can spin reels, and if a blank appears on the first column, then the blank can be changed to another symbol which will not (or can) change the final payout of the determined combination. In this manner, resulting combinations can be more suspenseful for players.
An issue with the preceding methodology is that it may not be acceptable to regulatory authorities to change a result of a game after it has already been determined, even if the payout has already been established and remains static.
In a further embodiment, results of a slot machine spin can be determined using a mapping paradigm. A user initiates a spin upon which a slot machine determines the results of the spin (before the spin is actually finished spinning). This can be done in the following manner.
A table such as Table XVII below can be used to map spins for a two reel machine, each reel with two symbols (a blank and a bar). Consider that this machine pays on bar/bar but does not pay on any other combination.








TABLE XVII





random number
result







0
blank/blank


1
blank/bar


2
bar/blank


3
bar/bar









For example, a random number can be generated from 0-3, and the mapping from Table XVII (or any table) can be used to determine the outcome of the spin, and then the reels can be spun to display the outcome.
This methodology still results in blanks being displayed. Consider if Table XVII is copied 4 times as illustrated in Table XVIII.








TABLE XVIII





random number
result
















0
blank/blank


1
blank/bar


2
bar/blank


3
bar/bar


4
blank/blank


5
blank/bar


6
bar/blank


7
bar/bar


8
blank/blank


9
blank/bar


10
bar/blank


11
bar/bar


12
blank/blank


13
blank/bar


14
bar/blank


15
bar/bar


16
blank/blank


17
blank/bar


18
bar/blank


19
bar/bar









A number from 1-19 can be selected and the respective results can then be displayed. Now consider table XIX, which eliminates the blank on the first column in all but one of the blank/blank results.








TABLE XIX





random number
result
















0
blank/blank


1
blank/bar


2
bar/blank


3
bar/bar


4
bar/blank


5
blank/bar


6
bar/blank


7
bar/bar


8
bar/blank


9
blank/bar


10
bar/blank


11
bar/bar


12
bar/blank


13
blank/bar


14
bar/blank


15
bar/bar


16
bar/blank


17
blank/bar


18
bar/blank


19
bar/bar









The change from Table XVIII to Table XVIIII does not affect the payouts or the return of this machine, since bar/bar is the only combination that results in a payout. Now, if a number from 1-19 is picked and the outcome of the machine is determined according to the respective mapping, the problem of blanks in column 1 has been addressed and is now very unlikely. It can even be removed entirely.
This method can be used for machines with any number of reels, symbols, etc. It can be especially useful for non-weighted games (such as five-reel games) wherein it is desirous to enhance the effect of the game by providing more suspenseful outcomes than if the outcomes were chosen randomly.
A five reel machine that has 20 symbols on each reel can have 20^5 or 3,200,000 possible outcomes. All of the outcomes can be determined and mapped as described herein, and results can be “retouched” or modified so that resultant combinations can be more suspenseful. More suspenseful can be for example: more wild symbols (especially in the leftmost columns), more scatter symbols, more “near misses” on payouts (e.g. 4 consecutive symbols if 5 are required), etc. Preferably, modifying the symbols does not affect the payouts. An automated routine can determine which symbols to change. For example, the routine can be programmed to change every other blank (or any symbol) on the leftmost reel (or any reel) to a wild (or other symbol), if the change will not affect the payout (or even if the change does affect the payout) for that particular set of outcomes. On a five reel machine it can be assumed that all paylines will be active (although this is not required to be the case).
Further, the entire mapping of the machine does not need to be pregenerated randomly and then retouched, but can also be generated automatically. For example, a human or computer can select resultant symbols for each mapping as desired.
FIG. 2 is a flowchart illustrating an exemplary method of mapping a reel outcome, according to an embodiment.
The method can begin with operation 200, wherein a table is provided which pre-stores spin results, such as Table XIX. This can be stored in any kind of computer memory, such as RAM, ROM, CD-ROM, flash memory, etc. The table can be that as described herein.
The method can proceed to operation 202, which selects a random number. The range of the number should typically be equal to the number of entries in the table.
From operation 202, the method can proceed to operation 204, which retrieves a respective entry in the table based upon the random number generated in operation 202. The entry in the table typically has results for all of the reels of the machine (any number of reels can be used).
From operation 204, the method can proceed to operation 206, which spins the reels to stop on the reel stops retrieved in operation 204. Each of the reels can be spin successively, as a standard slot machine does. The player has no idea the results of the spin were determined initially. The player also has no idea that the results of the spin were really chosen from a table.
Thus, using the method as illustrated in FIG. 2, reel stops can be determined which can make certain combinations more likely than other combinations. Thus combinations which have blanks in them can be made to occur less frequently. An advantage of this system over using weighted reels such as in the Telnaes patent, is that certain can be dependent upon other symbols. For example, in Telnaes, each symbol stops at a stop independent of where the other symbols have or will stop. Thus, in Telnaes, a result such as: blank/jackpot/blank may occur (a nonpaying combination on this machine).
In contrast, using the method described herein and illustrated in FIG. 2, the nonpaying result of: blank/jackpot/blank can be eliminated entirely or reduced in frequency to a very small probability. The undesirability of this combination is that the player receives a blank on the first symbol, which causes him to lose suspense. Instead, a result such as: jackpot/jackpot/blank (also a nonpaying combination on this machine) is preferable in that the player has received a “near miss.”
Thus, using the method as described in FIG. 2, entire combinations can be made more and less likely. This is in contrast to Telnaes, which is concerned with individual reels/symbols but does not operate on the entire reel combination as a whole.
It is also noted that any and/or all of the above embodiments, configurations, variations of the present invention described above can mixed and matched and used in any combination with one another. Any claim herein can be combined with any others (unless the results are nonsensical). Further, any mathematical formula given above also includes its mathematical equivalents, and also variations thereof such as multiplying any of the individual terms of a formula by a constant(s) or other variable.
Moreover, any description of a component or embodiment herein also includes hardware, software, and configurations which already exist in the prior art and may be necessary to the operation of such component(s) or embodiment(s).
Further, the operations described herein can be performed in any sensible order. Any operations not required for proper operation can be optional. Further, all methods described herein can also be stored on a computer readable storage to control a computer.
The many features and advantages of the invention are apparent from the detailed specification and, thus, it is intended by the appended claims to cover all such features and advantages of the invention that fall within the true spirit and scope of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation illustrated and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.

## Claims

1. A method of spinning at least three symbol-bearing reels in a slot machine game, the method comprising the following operations:
executing instructions on a computer controlling the slot machine game to perform:
generating a triggering condition that triggers a synchronous mode;
after generating the triggering condition, performing at least one of a plurality of synchronous-mode operations at least once, wherein the plurality of synchronous-mode operations include:
from a stopped position, moving a first reel of the symbol-bearing reels only an offset number of stops in a direction, wherein the offset number of stops is greater than zero, from a stopped position, moving a second reel of the symbol-bearing reels only the offset number of stops in the direction, wherein the first reel and the second reel are moved synchronously in unison, and awarding a payout, if earned, based on a final displayed combination of symbols on the at least three symbol-bearing reels.

2. A method as recited in claim 1, wherein the offset number of stops is a random number.

3. A method as recited in claim 1, wherein the offset number of stops is not one.

4. A method as recited in claim 1, wherein the slot machine game comprises at least five symbol-bearing reels.

5. A method as recited in claim 1, further comprising while performing a subset of the plurality of synchronous-mode operations at least once, holding stationary a third reel of the symbol-bearing reels, wherein the subset includes from a stopped position, moving a first reel of the symbol-bearing reels only an offset number of stops in a direction, wherein the offset number of stops is greater than zero, and from a stopped position, moving a second reel of the symbol-bearing reels only the offset number of stops in the direction, wherein the first reel and the second reel are moved synchronously in unison.

6. A method as recited in claim 1, further comprising repeating the plurality of synchronous-mode operations.

7. A method as recited in claim 1, wherein a symbol at the stopped position of the first reel is a blank and the symbol at the stopped position of the second reel is a blank.

8. An electronic slot machine, comprising:
a display operable to display at least three symbol-bearing reels;
a computer connected to the display, configured to:
determine if a synchronous mode trigger has occurred and, if so, perform at least one of a plurality of synchronous-mode operations at least once, wherein the plurality of synchronous-mode operations include:
from a stopped position, move a first reel of the symbol-bearing reels only an offset number of stops in a direction, wherein the offset number of stops is greater than zero, from a stopped position, move a second reel of the symbol-bearing reels only the offset number of stops in the direction, wherein the first reel and the second reel are moved synchronously in unison, and award a payout, if earned, based on a final displayed combination of symbols on the at least three symbol-bearing reels.

9. An electronic slot machine as recited in claim 8, wherein the computer is further configured such that the offset number of stops is a random number.

10. An electronic slot machine as recited in claim 8, wherein the computer is further configured such that the offset number of stops is not one.

11. An electronic slot machine as recited in claim 8, wherein the display is operable to display at least five symbol-bearing reels.

12. An electronic slot machine as recited in claim 8, wherein the computer is further configured such that a symbol at the stopped position of the first reel is a blank and the symbol at the stopped position of the second reel is a blank.

13. An electronic slot machine as recited in claim 8 wherein the computer is further configured such that an expected return of a synchronous spin of the first reel and the second reel is greater than an expected return of an independent spin of the first reel and the second reel.

14. An electronic slot machine as recited in claim 8, wherein the computer is further configured such that a hit frequency of a synchronous spin of the first reel and the second reel is greater than a hit frequency of an independent spin of the first reel and the second reel.

15. A method of spinning at least three symbol-bearing reels in a slot machine game comprising the following operations:
executing instructions on a computer controlling the slot machine game to:
perform a plurality of spin operations at least once, wherein the plurality of spin operations include:
randomly determining an offset number of stops greater than zero, from a stopped position, spinning a first reel of the symbol-bearing reels only the offset number of stops in a direction, from a stopped position, spinning a second reel of the symbol-bearing reels only the offset number of stops in the direction, wherein the first reel and the second reel are spun synchronously in unison, and award a payout, if earned, based on a final displayed combination of symbols on the symbol-bearing reels.

16. A method as recited in claim 15, wherein the spin operations further comprise from a stopped position, spinning a third reel of the symbol-bearing reels only the offset number of stops in the direction, wherein the first reel and the second reel and the third reel are spun synchronously in unison.

17. A method as recited in claim 15, wherein a third reel of the symbol-bearing reels spins not synchronously in unison with the first reel and the second reel during a subset of the plurality of spin operations, wherein the subset includes from a stopped position, spinning a first reel of the symbol-bearing reels only the offset number of stops in a direction and from a stopped position, spinning a second reel of the symbol-bearing reels only the offset number of stops in the direction, wherein the first reel and the second reel are spun synchronously in unison.

18. A method as recited in claim 15, wherein a third reel of the symbol-bearing reels remains stationary during the subset.

19. A method as recited in claim 15, wherein the slot machine game displays at least five symbol-bearing reels.

20. A method as recited in claim 15, wherein a symbol at the stopped position of the first reel is a blank and a symbol at the stopped position of the second reel is a blank.

21. An electronic slot machine, comprising:
a display operable to display at least three symbol-bearing reels;
a computer connected to the display, configured to:
perform a plurality of spin operations at least once, wherein the plurality of spin operations includes:
randomly determine an offset number of stops greater than zero, from a stopped position, spin a first reel of the symbol-bearing reels only the offset number of stops in a direction, and from a stopped position, spin a second reel of the symbol-bearing reels only the offset number of stops in the direction, wherein the first reel and the second reel are spun synchronously in unison, and award a payout, if earned, based on a final displayed combination of symbols on the symbol-bearing reels.

22. An electronic slot machine as recited in claim 21, wherein the computer is further configured such that an expected return of a synchronous spin of the first reel and the second reel is greater than an expected return of an independent spin of the first reel and the second reel.

23. An electronic slot machine as recited in claim 21, wherein the computer is further configured such that a hit frequency of a synchronous spin of the first reel and the second reel is greater than a hit frequency of an independent spin of the first reel and the second reel.

24. An electronic slot machine as recited in claim 21, wherein the computer is further configured such that the spin operations further comprise: spin a third reel of the symbol-bearing reels only the offset number of stops in the direction, wherein the first reel and the second reel and the third reel are spun synchronously in unison.

25. An electronic slot machine as recited in claim 21, wherein the computer is further configured to spin a third reel of the symbol-bearing reels not synchronously in unison with the first reel and the second reel during operations a subset of the plurality of spin operations, wherein the subset includes from a stopped position, spinning a first reel of the symbol-bearing reels only the offset number of stops in a direction and from a stopped position, spinning a second reel of the symbol-bearing reels only the offset number of stops in the direction, wherein the first reel and the second reel are spun synchronously in unison.

26. An electronic slot machine as recited in claim 21, wherein the computer is further configured to hold a third reel of the symbol-bearing reels stationary during the subset.

27. An electronic slot machine as recited in claim 21, wherein the display is operable to display at least five symbol-bearing reels.

28. A method to determine a reel mapping, comprising:
executing on a computer, instructions to perform the following:
determining a set of reels and a reel mapping of symbols for each reel in the set of reels;
determining a mapping of all possible outcomes of symbols on each reel using each reel's respective reel mapping, referenced by a number, each number having equal weight;
modifying the mapping by selectively remapping individual mappings for selected numbers so that the respective combination has more near misses for a predetermined set of paylines into a modified mapping;
utilizing the modified mapping in a slot machine game, by:
determining a random number;
retrieving a plurality of symbols from the modified mapping respective to the determined random number;
spinning reels on a slot machine game;
stopping the reels on each reel's respective symbol of the plurality of symbols; and
establishing a payout based on a combination of the plurality of symbols.

29. The method as recited in claim 28, wherein the set of reels comprises five reels.

30. The method as recited in claim 28, wherein the modifying selectively remaps individual mappings to add more wild symbols in the leftmost reel.

31. The method as recited in claim 28, wherein the modifying selectively remaps individual mappings to replace blank symbols with wild symbols when such change does not affect a payout for the respective mapping.

32. The method as recited in claim 28, wherein the modifying does not affect payouts.

33. The method as recited in claim 28 wherein the predetermined set of paylines comprises all paylines.

34. The method as recited in claim 28, wherein the modifying selectively remaps individual mappings to add additional scatter symbols.

35. A slot machine system to provide a remapped reel set, comprising:
a computer, configured to perform the following:
determine a set of reels and a reel mapping of symbols for each reel in the set of reels;
determine a mapping of all possible outcomes of symbols on each reel using each reel's respective reel mapping, referenced by a number, each number having equal weight;
modify the mapping by selectively remapping individual mappings for selected numbers so that the respective combination has more near misses for a predetermined set of paylines into a modified mapping;
a slot machine game, comprising a computer configured to:
determine a random number;
access the modified mapping;
retrieve from the modified mapping a plurality of symbols representing a mapping respective to the determined random number;
spin reels;
stop the reels on each reel's respective symbol of the plurality of symbols; and
establish a payout based on a combination of the plurality of symbols.

36. The system as recited in claim 35, wherein the set of reels comprises five reels.

37. The system as recited in claim 35, wherein the modify operation selectively remaps individual mappings to add more wild symbols in the leftmost reel.

38. The system as recited in claim 35, wherein the modify operation selectively remaps individual mappings to replace blank symbols with wild symbols when such change does not affect a payout for the respective mapping.

39. The system as recited in claim 35, wherein the modify operation does not affect payouts.

40. The system as recited in claim 35 wherein the predetermined set of paylines comprises all paylines.

41. The system as recited in claim 35, wherein the modify operation selectively remaps individual mappings to add additional scatter symbols.