Patent Publication Number: US-2023154284-A1

Title: Method of Gaming, a Gaming System and a Game Controller Having Moveable Symbols at Increasing Display Positions with Different Appearances

Description:
RELATED APPLICATIONS 
     The present application is a continuation of and claims priority to U.S. patent application Ser. No. 17/144,962, filed Jan. 8, 2021, which issued on Jan. 24, 2023, as U.S. Pat. No. 11,562,624, which is a continuation of and claims priority to U.S. patent application Ser. No. 16/372,617, having a filing date of Apr. 2, 2019, which issued on Feb. 16, 2021, as U.S. Pat. No. 10,922,920, which is a continuation of and claims priority to U.S. patent application Ser. No. 14/869,341, having a filing date of Sep. 29, 2015, which issued on Apr. 2, 2019, as U.S. Pat. No. 10,249,141, which claims priority to Australian Provisional Patent Application No. 2014903915, having a filing date of Sep. 29, 2014, which are all incorporated herein by reference in their entireties. 
    
    
     BACKGROUND 
     In electronic gaming systems such as spinning reel or “slot” gaming machines, symbols are selected for display on a display of the machine. The displayed symbols are evaluated to determine whether an award is to be made to a player. 
     While such gaming systems provide players with enjoyment, a need exists for alternative gaming systems in order to maintain or increase player enjoyment. 
     SUMMARY 
     In accordance with a first aspect, the present invention provides an electronic gaming system comprising: a first video display; a second video display; and a game controller arranged to: select a plurality of symbols from a symbol set for display on the first video display and the second video display; and evaluate a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award, wherein a number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the game controller in a previous game instance. 
     In an embodiment, during the first game instance the one or more of the plurality of symbols of the symbol subset are displayed in respective symbol display positions arranged on the first video display. During the last game instance the symbol subset may comprise all the symbols of the plurality of symbols. 
     In accordance with a second aspect, the present invention provides an electronic gaming system comprising: a first video display; a second video display; and a game controller arranged to: select a plurality of symbols from a symbol set for display on the first video display and the second video display; and evaluate a symbol display position subset comprising one or more of the plurality of symbol display positions to determine whether to make an award; wherein a number of symbol display positions of the symbol display position subset is higher than a number of symbol display positions in the symbol display position subset evaluated by the game controller in a previous game instance. 
     In an embodiment, during the first game instance the one or more of the plurality of symbol display positions of the symbol display position subset are arranged on the first video display. During the last game instance the symbol display position subset may comprise all the symbol display positions of the plurality of symbol display positions. 
     In an embodiment, the second video display is positioned above the first video display. The first and the second video displays may be arranged to display a single gaming area. Each of the first and second video display may comprise a plurality of symbol display positions arranged in five columns. 
     In an embodiment, the plurality of symbols comprise a movable symbol and the game controller is arranged to move the movable symbol from a first symbol display position to a second symbol display position. 
     In an embodiment, the first symbol display position is located below the second symbol display position. 
     In an embodiment, upon moving of the movable symbol from the first symbol display position to the second symbol display position, the movable symbol replaces one or more symbols positioned at the second symbol display position. 
     In an embodiment, the movable symbol is associated with an animated object. 
     In an embodiment, the movable symbol is a wild symbol. 
     In an embodiment, the game controller is further arranged to increase a multiplier. The multiplier may be increased upon moving of the movable symbol. 
     In accordance with a third aspect, the present invention provides an electronic gaming system comprising: at least one video display; and a game controller arranged to: select a plurality of symbols from a symbol set for display on the at least one video display; and evaluate a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award; the plurality of symbols comprising a movable symbol and the game controller being arranged to: move the movable symbol from a first symbol display position to a second symbol display position located above the first symbol display position; wherein a number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the game controller in a previous game instance. 
     In an embodiment, the gaming system comprises a first video display and a second video display positioned above the first video display. 
     In an embodiment, the movable symbol is a wild symbol. 
     In accordance with a fourth aspect, the present invention provides an electronic game controller, the game controller arranged to: select a plurality of symbols from a symbol set for display on a first video display and a second video display, and evaluate a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award; wherein a number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the game controller in a previous game instance. 
     In an embodiment, during the first game instance, the game controller is arranged to control the first video display and the second video display to display the plurality of symbols of the symbol subset in respective symbol display positions arranged on the first video display. The game controller may be further arranged to control the first and the second video displays to display a single gaming area. The game controller may be further arranged to control the first and the second video displays to display a plurality of symbol display positions arranged in five columns. 
     In an embodiment, the plurality of symbols comprise a movable symbol and the game controller is arranged to move the movable symbol from a first symbol display position to a second symbol display position. 
     In an embodiment, the game controller is arranged in a manner such that, upon moving of the movable symbol from the first symbol display position to the second symbol display position, the movable symbol replaces one or more symbols positioned at the second symbol display position. 
     In an embodiment, the game controller is arranged to control the first and the second display to display an animation upon moving of the movable symbol. 
     In an embodiment, the game controller is further arranged to increase a multiplier upon moving of the movable symbol. 
     In an embodiment, the movable symbol is a wild symbol. 
     In accordance with a fifth aspect, the present invention provides an electronic gaming system comprising: a first video display; a second video display; and a symbol selector arranged to select a plurality of symbols from a symbol set for display on the first video display and the second video display; and an outcome evaluator arranged to evaluate a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award; wherein a number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the outcome evaluator in a previous game instance. 
     In an embodiment, during the first game instance the one or more of the plurality of symbols of the symbol subset are displayed in respective symbol display positions arranged on the first video display. During the last game instance the symbol subset may comprise all the symbols of the plurality of symbols. 
     In an embodiment, the second video display is positioned above the first video display. 
     In an embodiment, the plurality of symbols comprise a movable symbol and the gaming system further comprises a symbol mover arranged to move the movable symbol from a first symbol display position to a second symbol display position. 
     In an embodiment, the movable symbol is a wild symbol. 
     In an embodiment, the gaming system further comprises a multiplier controller arranged to increase a multiplier. 
     In accordance with a sixth aspect, the present invention comprises an electronic method of gaming, comprising a game controller: selecting a plurality of symbols from a symbol set for display on a first video display and a second video display, and evaluating a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award; wherein a number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the game controller in a previous game instance. 
     In an embodiment, the plurality of symbols comprise a movable symbol and the game controller moves the movable symbol from a first symbol display position to a second symbol display position. 
     In an embodiment, the game controller is further arranged to increase a multiplier. 
     In accordance with a seventh aspect, the present invention provides an electronic gaming system comprising: a first video display means; a second video display means; and means for selecting a plurality of symbols from a symbol set for display on the first video display and the second video display; means for evaluating a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award; wherein a number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the means for evaluating the symbol subset in a previous game instance. 
     In accordance with an eighth seventh aspect, the present invention provides computer program code which when executed by a processor causes the processor to: select a plurality of symbols from a symbol set for display on a first video display and a second video display, and evaluate a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award; wherein a number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the processor in a previous game instance. 
     In accordance with a ninth aspect, the present invention provides a tangible computer readable medium comprising the computer program code in accordance with the eighth aspect. 
     In accordance with a tenth aspect, the present invention provides a distributed electronic gaming system comprising: a gaming server suitable for communicating with one or more client devices over a communication network; the gaming server comprising a game controller arranged to select a plurality of symbols from a symbol set for display on a first video display area and a second video display area of the one or more client devices and, evaluate a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award; wherein a number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the game controller in a previous game instance. 
     In an embodiment, during the first game instance the one or more of the plurality of symbols of the symbol subset are displayed in respective symbol display positions arranged on the first video display area of the one or more client devices. 
     In an embodiment, the plurality of symbols comprise a movable symbol and the game controller is arranged to move the movable symbol from a first symbol display position to a second symbol display position. 
     In an embodiment, the movable symbol is a wild symbol. 
     In an embodiment, the game controller is further arranged to increase a multiplier. 
     In accordance with yet another aspect, the present invention provides an electronic game controller. The game controller may select a plurality of symbols from a symbol set for display on a first video display and a second video display, and evaluate a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award. A number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the game controller in a previous game instance. 
     During a first game instance, the game controller may control the first video display and the second video display to display the plurality of symbols of the symbol subset in respective symbol display positions arranged on the first video display. 
     The game controller may further control the first and the second video displays to display a single gaming area. 
     The game controller may further control the first and the second video displays to display a plurality of symbol display positions arranged in five columns. 
     The plurality of symbols may comprise a movable symbol and the game controller moves the movable symbol from a first symbol display position to a second symbol display position. 
     The game controller may be arranged in a manner such that, upon moving of the movable symbol from the first symbol display position to the second symbol display position, the movable symbol replaces one or more symbols positioned at the second symbol display position. 
     The game controller may control the first and the second video display to display an animation upon moving of the movable symbol. 
     The movable symbol may be a wild symbol. 
     The game controller may increase a multiplier. 
     The multiplier may be increased upon moving of the movable symbol. 
     In accordance with still another aspect, the present invention provides an electronic gaming system comprising: a first video display; a second video display; and a symbol selector to select a plurality of symbols from a symbol set for display on the first video display and the second video display; and an outcome evaluator to evaluate a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award. A number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the outcome evaluator in a previous game instance. 
     During a first game instance, the one or more of the plurality of symbols of the symbol subset are displayed in respective symbol display positions arranged on the first video display. 
     During a last game instance, the symbol subset comprises all the symbols of the plurality of symbols. 
     The second video display may be positioned above the first video display. 
     The plurality of symbols may comprise a movable symbol. The gaming system may further comprise a symbol mover to move the movable symbol from a first symbol display position to a second symbol display position. 
     The movable symbol may be a wild symbol. 
     The gaming system may further comprise a multiplier controller to increase a multiplier. 
     In accordance with still another aspect, the present invention provides an electronic method of gaming, comprising a game controller. The method includes selecting a plurality of symbols from a symbol set for display on a first video display and a second video display, and evaluating a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award. A number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the game controller in a previous game instance. 
     The plurality of symbols may comprise a movable symbol. The game controller may move the movable symbol from a first symbol display position to a second symbol display position. 
     The game controller may increase a multiplier. 
     In accordance with still another aspect, the present invention provides an electronic gaming system comprising: a first video display means; a second video display means; and means for selecting a plurality of symbols from a symbol set for display on the first video display and the second video display; means for evaluating a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award; wherein a number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the means for evaluating the symbol subset in a previous game instance. 
     In accordance with still another aspect, the present invention provides a computer program code which when executed by a processor causes the processor to select a plurality of symbols from a symbol set for display on a first video display and a second video display, and evaluate a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award. A number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the processor in a previous game instance. 
     A tangible computer readable medium may comprise the computer program code. 
     In accordance with still another aspect, the present invention provides a distributed electronic gaming system comprising: a gaming server suitable for communicating with one or more client devices over a communication network, the gaming server comprising a game controller arranged to select a plurality of symbols from a symbol set for display on a first video display area and a second video display area of the one or more client devices and, evaluate a symbol subset comprising one or more of the plurality of symbols to determine whether to make an award; wherein a number of symbols of the symbol subset is higher than a number of symbols in the symbol subset evaluated by the game controller in a previous game instance. 
     During a first game instance, the one or more of the plurality of symbols of the symbol subset may be displayed in respective symbol display positions arranged on the first video display area of the one or more client devices. 
     The plurality of symbols may comprise a movable symbol and the game controller may move the movable symbol from a first symbol display position to a second symbol display position. 
     The movable symbol may be a wild symbol. 
     The game controller may increase a multiplier. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       An exemplary embodiment of the invention will now be described with reference to the accompanying drawings in which: 
         FIG.  1    is a block diagram of the core components of a gaming system; 
         FIG.  2    is a perspective view of a stand alone gaming machine; 
         FIG.  3    is a block diagram of the functional components of a gaming machine; 
         FIG.  4    is a schematic diagram of the functional components of a memory; 
         FIG.  5    is a schematic diagram of a network gaming system; 
         FIG.  6    is a further block diagram of a gaming system; 
         FIG.  7    is a flow chart of an embodiment; 
         FIG.  8 A and  8 B  are screen shots of a first video display and a second video display of a gaming area in accordance with an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to the drawings, there is shown an embodiment of an electronic gaming system with two video displays which display a gaming area. The gaming system has a game controller that controls several elements of the system to implement instances of a game. The game controller selects a plurality of symbols from a symbol set and displays the symbols on the two video displays at respective symbol display positions. For each game instance, the controller evaluates a symbol subset to determine whether to make an award. If the controller determines that an award has to be made based on the symbols of the symbol subset, the determined award is issued to the player. The symbol subset comprises one or more of the plurality of symbols on the two screens. The number of symbols in the symbol subset is variable and increases for each game instance. During a game, instance after instance, the number of symbols evaluated by the game controller to determine whether an award has to be made increases and so the number of winning lines which can generate an award. 
     In embodiments, the two video displays are positioned one on top of the other. During the first instance of the game the one or more symbols of the symbol subset are positioned on the bottom video display. The top video display may also have symbol display positions occupied by symbols but, during the first instance, the symbols of the top video display are not part of the symbol subset and do not contribute to determining whether an award has to be made. During the last instance of the game, all the symbols displayed in the top video display are part of the symbol subset and do contribute to determining whether an award has to be made. 
     In some embodiments, during the first instance the one or more symbols of the symbol subset are positioned in symbol display positions on the bottom video display and the top video display may not show any symbol display positions occupied by symbols. The total number of symbol display positions increases throughout the game and a portion of the symbol display positions are displayed on the top video display. 
     In some embodiments, there is a movable symbol occupying one or more symbol display positions and the game controller, moves the movable symbol upwards, from a first symbol display position to a second symbol display position. The movable symbol typically replaces the symbols displayed at the second display position. 
     In some embodiments, when the movable symbol is being moved, an animation is shown on one or both of the two video displays. The movable symbol may be an animated symbol and may also be a wild symbol. The game controller increases a multiplier upon moving of the movable symbol. 
     General Construction of Gaming System 
     The gaming system can take a number of different forms. In a first form, a stand alone gaming machine is provided wherein all or most components required for implementing the game are present in a player operable gaming machine. 
     In a second form, a distributed architecture is provided wherein some of the components required for implementing the game are present in a player operable gaming machine and some of the components required for implementing the game are located remotely relative to the gaming machine. For example, a “thick client” architecture may be used wherein part of the game is executed on a player operable gaming machine and part of the game is executed remotely, such as by a gaming server; or a “thin client” architecture may be used wherein most of the game is executed remotely such as by a gaming server and a player operable gaming machine is used only to display audible and/or visible gaming information to the player and receive gaming inputs from the player. 
     However, it will be understood that other arrangements are envisaged. For example, an architecture may be provided wherein a gaming machine is networked to a gaming server and the respective functions of the gaming machine and the gaming server are selectively modifiable. For example, the gaming system may operate in standalone gaming machine mode, “thick client” mode or “thin client” mode depending on the game being played, operating conditions, and so on. Other variations will be apparent to persons skilled in the art. 
     Irrespective of the form, the gaming system  1  has several core components. At the broadest level, the core components are a player interface  50  and a game controller  60  as illustrated in  FIG.  1   . The player interface is arranged to enable manual interaction between a player and the gaming system and for this purpose includes the input/output components required for the player to enter instructions to play the game and observe the game outcomes. 
     Components of the player interface may vary from embodiment to embodiment but will typically include a credit mechanism  52  to enable a player to input credits and receive payouts, one or more displays  54 , a game play mechanism  56  including one or more input devices that enable a player to input game play instructions (e.g. to place a wager), and one or more speakers  58 . 
     The game controller  60  is in data communication with the player interface and typically includes a processor  62  that processes the game play instructions in accordance with game play rules and outputs game play outcomes to the display. Typically, the game play rules are stored as program code in a memory  64  but can also be hardwired. Herein the term “processor” is used to refer generically to any device that can process game play instructions in accordance with game play rules and may include: a microprocessor, microcontroller, programmable logic device or other computational device, a general-purpose computer (e.g. a PC) or a server. That is a processor may be provided by any suitable logic circuitry for receiving inputs, processing them in accordance with instructions stored in memory and generating outputs (for example on the display). Such processors are sometimes also referred to as central processing units (CPUs). Most processors are general purpose units, however, it is also know to provide a specific purpose processor using an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA). 
     A gaming system in the form of a standalone gaming machine  10  is illustrated in  FIG.  2   . The gaming machine  10  includes a console  12  having a first video display  14 . A mid-trim  20  of the gaming machine  10  houses a bank of buttons  22  for enabling a player to interact with the gaming machine, in particular during game play. The video display  14  may also have a touch screen to enable the user to input instructions. The video display  14  shown in  FIG.  2    is in the form of a video display unit, particularly a cathode ray tube device. Alternatively, the display  14  may be a liquid crystal display, plasma screen, any other suitable video display unit. The top box  26  has a secondary video which may be of the same type as the display  14 , or of a different type. 
     While not shown in  FIG.  2   , the mid-trim  20  also typically houses a credit input mechanism such as a coin input chute and a bill collector.  FIG.  2    also shows the credit input mechanism in the form of a player marketing module  51  having a reading device  53  for the purpose of reading a player tracking device, for example as part of a loyalty program. The player tracking device may be in the form of a card, flash drive or any other portable storage medium capable of being read by the reading device. The player marketing module  51  also allows the player to transferring credits to the gaming machine from credits stored on the player tracking device or by transferring credits from a player account in data communication with the player marketing module. Other embodiments of gaming machines may have a ticket reader for reading tickets having a value and crediting the player based on the face value of the ticket. 
     Artwork and/or information may be provided on a front panel  29  of the console  12 . A coin tray  30  is mounted beneath the front panel  29  for dispensing cash payouts from the gaming machine  10 . 
       FIG.  3    shows a block diagram of operative components of a typical gaming machine which may be the same as or different to the gaming machine of  FIG.  2   . 
     The gaming machine  100  includes a game controller  101  having a processor  102  mounted on a circuit board. Instructions and data to control operation of the processor  102  are stored in a memory  103 , which is in data communication with the processor  102 . Typically, the gaming machine  100  will include both volatile and non-volatile memory and more than one of each type of memory, with such memories being collectively represented by the memory  103 . 
     The gaming machine has hardware meters  104  for purposes including ensuring regulatory compliance and monitoring player credit, an input/output (I/O) interface  105  for communicating with peripheral devices of the gaming machine  100 . The input/output interface  105  and/or the peripheral devices may be intelligent devices with their own memory for storing associated instructions and data for use with the input/output interface or the peripheral devices. A random number generator module  113  generates random numbers for use by the processor  102 . Persons skilled in the art will appreciate that the reference to random numbers includes pseudo-random numbers. 
     In the example shown in  FIG.  3   , a player interface  120  includes peripheral devices that communicate with the game controller  101  including one or more displays  106 , a touch screen and/or buttons  107  (which provide a game play mechanism), a card and/or ticket reader  108 , a printer  109 , a bill acceptor and/or coin input mechanism  110  and a coin output mechanism  111 . Additional hardware may be included as part of the gaming machine  100 , or hardware may be omitted as required for the specific implementation. For example, while buttons or touch screens are typically used in gaming machines to allow a player to place a wager and initiate a play of a game any input device that enables the player to input game play instructions may be used. For example, in some gaming machines a mechanical handle is used to initiate a play of the game. Persons skilled in the art will also appreciate that a touch screen can be used to emulate other input devices, for example, a touch screen can display virtual buttons which a player can “press” by touching the screen where they are displayed. 
     In addition, the gaming machine  100  may include a communications interface, for example a network card  112 . The network card may, for example, send status information, accounting information or other information to a bonus controller, central controller, server or database and receive data or commands from the bonus controller, central controller, server or database. In embodiments employing a player marketing module, communications over a network may be via player marketing module— i.e. the player marketing module may be in data communication with one or more of the above devices and communicate with it on behalf of the gaming machine. 
       FIG.  4    shows a block diagram of the main components of an exemplary memory  103 . The memory  103  includes RAM  103 A, EPROM  103 B and a mass storage device  103 C. The RAM  103 A typically temporarily holds program files for execution by the processor  102  and related data. The EPROM  103 B may be a boot ROM device and/or may contain some system or game related code. The mass storage device  103 C is typically used to store game programs, the integrity of which may be verified and/or authenticated by the processor  102  using protected code from the EPROM  103 B or elsewhere. 
     It is also possible for the operative components of the gaming machine  100  to be distributed, for example input/output devices  106 ,  107 ,  108 ,  109 ,  110 ,  111  to be provided remotely from the game controller  101 . 
       FIG.  5    shows a gaming system  200  in accordance with an alternative embodiment. The gaming system  200  includes a network  201 , which for example may be an Ethernet network. Gaming machines  202 , shown arranged in three banks  203  of two gaming machines  202  in  FIG.  5   , are connected to the network  201 . The gaming machines  202  provide a player operable interface and may be the same as the gaming machines  10 ,  100  shown in  FIGS.  2  and  3   , or may have simplified functionality depending on the requirements for implementing game play. While banks  203  of two gaming machines are illustrated in  FIG.  5   , banks of one, three or more gaming machines are also envisaged. 
     One or more displays  204  may also be connected to the network  201 . For example, the displays  204  may be associated with one or more banks  203  of gaming machines. The displays  204  may be used to display representations associated with game play on the gaming machines  202 , and/or used to display other representations, for example promotional or informational material. 
     In a thick client embodiment, game server  205  implements part of the game played by a player using a gaming machine  202  and the gaming machine  202  implements part of the game. With this embodiment, as both the game server and the gaming device implement part of the game, they collectively provide a game controller. A database management server  206  may manage storage of game programs and associated data for downloading or access by the gaming devices  202  in a database  206 A. Typically, if the gaming system enables players to participate in a Jackpot game, a Jackpot server  207  will be provided to perform accounting functions for the Jackpot game. A loyalty program server  212  may also be provided. 
     In a thin client embodiment, game server  205  implements most or all of the game played by a player using a gaming machine  202  and the gaming machine  202  essentially provides only the player interface. With this embodiment, the game server  205  provides the game controller. The gaming machine will receive player instructions, pass these to the game server which will process them and return game play outcomes to the gaming machine for display. In a thin client embodiment, the gaming machines could be computer terminals, e.g. PCs running software that provides a player interface operable using standard computer input and output components. Other client/server configurations are possible, and further details of a client/server architecture can be found in WO 2006/052213 and PCT/SE2006/000559, the disclosures of which are incorporated herein by reference. 
     Servers are also typically provided to assist in the administration of the gaming network  200 , including for example a gaming floor management server  208 , and a licensing server  209  to monitor the use of licenses relating to particular games. An administrator terminal  210  is provided to allow an administrator to run the network  201  and the devices connected to the network. 
     The gaming system  200  may communicate with other gaming systems, other local networks, for example a corporate network, and/or a wide area network such as the Internet, for example through a firewall  211 . 
     Persons skilled in the art will appreciate that in accordance with known techniques, functionality at the server side of the network may be distributed over a plurality of different computers. For example, elements may be run as a single “engine” on one server or a separate server may be provided. For example, the game server  205  could run a random generator engine. Alternatively, a separate random number generator server could be provided. Further, persons skilled in the art will appreciate that a plurality of game servers could be provided to run different games or a single game server may run a plurality of different games as required by the terminals. 
     Further Detail of Gaming System 
     In order to participate in the game, the player operates the game play mechanism  56  to specify a wager and hence win entitlements which will be evaluated for this play of the game and initiates a play of the game. Persons skilled in the art will appreciate that a player&#39;s win entitlement will vary from game to game dependent on player selections. In most spinning reel games, it is typical for the player&#39;s entitlement to be affected by the amount they wager and selections they make (i.e. the nature of the wager). For example, a player&#39;s win entitlement may be based on how many lines they play in each game—e.g. a minimum of one line up to the maximum number of lines allowed by the game (noting that not all permutations of win lines may be available for selection) and how much they wager per line. Such win lines are typically formed by a combination of symbol display positions, one from each reel, the symbol display positions being located relative to one another such that they form a line. 
     In many games, the player&#39;s win entitlement is not strictly limited to the lines they have selected, for example, “scatter” pays are awarded independently of a player&#39;s selection of pay lines and are an inherent part of the win entitlement. 
     Persons skilled in the art will appreciate that in other embodiments, the player may obtain a win entitlement by selecting a number of reels to play and an amount to wager per reel. Such games are marketed under the trade name “Reel Power” by Aristocrat Leisure Industries Pty Ltd. The selection of the reel means that each displayed symbol of the reel can be substituted for a symbol at one or more designated display positions. In other words, all symbols displayed at symbol display positions corresponding to a selected reel can be used to form symbol combinations with symbols displayed at a designated, symbol display positions of the other reels. For example, if there are five reels and three symbol display positions for each reel such that the symbol display positions comprise three rows of five symbol display positions, the symbols displayed in the center row are used for non-selected reels. The total number of ways to win is determined by multiplying the number of active display positions of each reels, the active display positions being all display positions of each selected reel and the designated display position of the non-selected reels. As a result for five reels and fifteen display positions there are 243 ways to win. 
     In other embodiments a player win entitlement may be affected by purchasing access to particular pay tables—e.g. a first bet amount entitles the player to wins including cherry symbols and a second amount entitles them to wins including plum symbols. 
     In  FIG.  6   , the processor  62  of the game controller  60  is shown implementing a number of modules based on program code and data stored in memory  64 . These modules include a symbol selector  623 , a symbol mover  625 , a symbol evaluator (or outcome evaluator)  626  and a prize awarder  628 . Persons skilled in the art will appreciate that one or more of the modules could be implemented in some other way, for example by a dedicated circuit. 
     As indicated above, depending on the embodiment, the game controller  60  may be arranged to select a plurality of symbols for display on video displays  54 , for a sequence of game instances. 
     In the embodiment where symbols are selected for display at each video display  54 , the symbol selector  623  operates in response to a player&#39;s operation of the game play mechanism  56  to place a wager and initiate a play of a game. In this embodiment, there are multiple display areas arranged on the two symbol displays  54 A and  54 B, and the symbol selector  623  initiates play of a game by selecting, independently for each of the display areas of the symbol display provided by the displays  54 A and  54 B, a set or plurality of symbols for display at respective symbol display positions on the video displays  54 . When in use, the symbol selector  623  selects the symbols for display based on random numbers (or pseudo-random numbers) generated by a random number generator (RNG)  622  implemented by the processor  62  and symbols sets  642  stored in the memory  64  of the game controller  60 , and a display controller  629  implemented by the processor  62  which controls the two displays  54 A and  54 B to display the selected symbols on each of the display areas of the video displays  54 . The display areas are provided on two video displays  54 A and  54 B, the processor  62  may implement separate display controllers for controlling the separate displays. However, as indicated above, it is envisaged that the display areas of the symbol display may alternatively be provided on a single video display in an alternative embodiment. Also, it is envisaged that, in an alternative embodiment, the display areas of the symbol display may alternatively be on the respective displays of separate gaming machines comprising separate game controllers comprising separate processors implementing separate display controllers, and separate games may be played at the separate gaming machines. 
     In the embodiment described, there are two display areas provided on two separate video displays  54 A,  54 B. In a first implementation of the game, the same amount of symbol display positions may be arranged on the first and the second video displays  54 A and  54 B. In a second implementation of the game, more symbol display positions may be arranged in a first video display  54 A when compared to the second video display  54 B. 
     For each instance of the game, a subset of the symbols displayed in the symbol display positions is evaluated by the outcome evaluator  626  to determine whether to make an award. The outcome evaluator  626  communicates with the winning combination data  649  stored in memory  64 . 
     The symbol selector  623  selects symbols from a symbol set and assigns the selected symbols to a plurality of respective symbol display positions on the first and the second video displays  54 A and  54 B. The symbols in each symbol display position may be changed by the symbol selector  623  for each instance of the game. The symbols in each column of the gaming area may be arranged in a reel configuration and the reel may be spun at each instance of the game changing the symbol in the symbol display positions positioned in that column of the gaming area. 
     During each instance of the game the outcome evaluator  626  evaluates a subset of the symbols on the gaming area to determine whether to instruct the prize awarder  928  to make an award. Processor  62  controls the outcome evaluator  626  to evaluate a variable subset of symbols at each game instance. The number of symbols in the symbol subset evaluated by the outcome evaluator  626  increases for each game instance. The number of winning lines which can generate an award increase with the increasing number of symbols. Processor  62  controls the outcome evaluator  626  and the two video displays  54 A and  54 B in a manner such that, during the first instance of the game, the one or more symbols of the symbol subset which are evaluated by the outcome evaluator  626  are positioned in symbol display positions on the first video display  54 A. The second video display  54 B is positioned on top of the first video display  54 A and displays symbols in respective symbol display positions which are not part of the symbol subset and are not evaluated by the outcome evaluator  626 . During the game, symbols are added to the symbol subset for each instance and, during the last instance of the game, all the symbols displayed in the second video display  54 B are part of the symbol subset and are evaluated by the outcome evaluator  626 . The symbols comprised in the symbol subset which are evaluated by the outcome evaluator  626  have a different graphical appearance which differentiates them from the symbols which are not evaluated. For example, the symbols which are not evaluated may look like frozen symbols. These symbols may become unfrozen as they are added to the symbol subset. 
     The symbol selector  623  selects a movable symbol which may take one or more symbols positions on the gaming area. For each game instance, symbol mover  625  moves the movable symbol upwards in the gaming area to swap its positions with other symbols on the gaming area. While the movable symbol is being moved by the symbol mover  625 , the processor  62  adds one or more symbols to the symbol subset and communicates with the prize awarder  628  to increase an award multiplier. The movable symbol may be a wild symbol. 
     When the symbols of the symbol subset are evaluated by the outcome evaluator  626 , the prize awarder  628  may make one or more awards based on the prize data  648  stored in the memory  64  if winning symbol combinations are identified in accordance with winning combinations data  649 . 
     In a second embodiment, not all the symbol display positions are positioned on the display area of the video displays  54 A and  54 B. In a manner similar to the addition of symbols to the symbol subset which is evaluated by the outcome evaluator  626 , new symbol display positions are added to the display area for each game instance. For example during the first game instance only the first video display  54 A may comprise symbol display positions, while the second video display may show an animation or a picture. While the game is played, for each instance of the game symbol display positions may be added and may be displayed on the second video display  54 B. In this embodiment the subset of symbols may comprise all the symbols in all the display positions for each instance of the game. In this case the subset of symbols is increased at each instance by increasing the number of symbol display positions. The symbol subset may also comprise some of the symbols displayed at the symbol display positions, and some other is the symbols may not be part for the subset and be displayed, for example, as frozen symbols. 
     In  FIG.  7   , there is shown a flowchart  700  of a method of gaming in respect of the first embodiment. The beginning of the game may be triggered by several events, for example a player places a wager and initiates a play of the game, or a player is playing a an initial game and a particular condition which takes place in the initial game triggers a feature game which may be the game of the first embodiment. Types of feature games include: those where a series of free game events are awarded such as free games or re-spins (where some reels are held while others are re-spun); games where the symbols on the reel are changed; and “second screen” games where game play is totally different to the base game, for example where the player makes selections in a “pick a box type” game. 
     At step  702 , the symbol selector  623  selects a plurality of symbols from a symbol set. At step  704  the processor  62  controls the first video display  54 A and the second video display  54 B to display the plurality of symbols at respective display positions. At step  708  the symbol mover module  625  moves the movable symbol upwards on the gaming area. At step  709  the processor  62  adds one or more symbols to the symbol subset and, at step  710  the outcome evaluator  626  evaluates the symbol subset and determines whether to make an award. At this stage the processor  62  may increase a prize multiplier. At step  712  the prize awarder  628  makes one or more awards based on the prize data  648  stored in the memory  64  if winning symbol combinations are identified in accordance with winning combinations data  649 . For each game instance some or all of the steps of flow chart  700  are performed. 
     Referring now to  FIGS.  8 A and  8 B , there are shown screen shots  800  and  850  of a first and a second video display of a gaming area in accordance with the first embodiment. Screen shot  800  is a screen shot of (top) display  54 B, in accordance with the first embodiment and screen shot  850  is a screen shot of (bottom) display  54 A, in accordance with the first embodiment. 
     The gaming area shown in the first and second video displays replicates an ice wall which is a landmark of motion picture series “Game of Thrones”. The symbols available to the symbol selector  623  represent characters of the same series  852 . Screen shots  800  and  850  show a possible configuration of the symbols positioned on the first and the second video display  54 A and  54 B during a game. The majority of the symbols of the symbol subset evaluated by the symbol evaluator  626  are displayed in symbols display positions on the first video display  54 A in clear colours,  852 . The remaining symbols, which are not part of the symbol subset and are not evaluated by the symbol evaluator  626 , are displayed in symbols display positions on the second video display  54 B and appear as frozen symbols,  854 . The movable symbol is provided in the form of an elevator  856 . For each game instance, elevator  856  moves upwards along the ice and ice falls away from the frozen symbols above the elevator  856 . As the ice falls from these symbols, these symbols are added to the symbol subset increasing the number of paylines and the possible winning combinations available to the player. 
     The movable symbol  856  is also a wild symbol. In particular, the elevator  856  is a two symbol display positions high wild symbol and carries an award multiplier which is incremented each time the elevator  856  is moved up along the ice wall. 
     Symbols positioned on symbol display positions on the same columns of the gaming area belong to symbol reels. The gaming area has 5 reels. At the beginning of the game each reel may only have one symbol ‘unfrozen’ which is part of the evaluated symbol subset. During the last instance of the game, the elevator  856  reaches the top of the wall and all the symbols are ice free and part of the symbol subset. When the reels are spun in this last instance the reels are expanded to a 16x5 matrix of symbols display positions with symbols evaluated by the symbol evaluator  626 . This provides the player with 134 available lines. 
     To be awarded a prize, during one of the game instances the reels are spun and a given combination of symbols of the symbol subset must be obtained along an available winning line. The symbol evaluator  626  implemented by the processor  62  of the game controller  60  of the gaming machine then evaluates the symbol subset and the prize in accordance with winning combinations data  649  and the prize awarder  628  awards a prize in accordance with prize data  648 . 
     In the above description certain steps are described as being carried out by a processor of a gaming system, it will be appreciated that such steps will often require a number of sub-steps to be carried out for the steps to be implemented electronically, for example due to hardware or programming limitations. For example, to carry out a step such as evaluating, determining or selecting, a processor may need to compute several values and compare those values. 
     As indicated above, the method may be embodied in program code. The program code could be supplied in a number of ways, for example on a tangible computer readable storage medium, such as a disc or a memory device, e.g. an EEPROM, (for example, that could replace part of memory  103 ) or as a data signal (for example, by transmitting it from a server). Further different parts of the program code can be executed by different devices, for example in a client server relationship. Persons skilled in the art will appreciate that program code provides a series of instructions executable by the processor. 
     It will be understood to persons skilled in the art of the invention that many modifications may be made without departing from the spirit and scope of the invention, in particular it will be apparent that certain features of embodiments of the invention can be employed to form further embodiments. 
     It is to be understood that, if any prior art is referred to herein, such reference does not constitute an admission that the prior art forms a part of the common general knowledge in the art in any country. 
     In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word “comprise” or variations such as “comprises” or “comprising” is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.