Patent Publication Number: US-9836914-B2

Title: Gaming system and a method of gaming

Description:
RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 13/951,197 having a filing date of Jul. 25, 2013, which is a continuation of U.S. patent application Ser. No. 13/556,457 having a filing date of Jul. 24, 2012, now issued as U.S. Pat. No. 8,512,126, which is a continuation of U.S. patent application Ser. No. 12/435,035 having a filing date of May 4, 2009, now issued as U.S. Pat. No. 8,251,796, which claims priority to U.S. Provisional Patent Application No. 61/050,032 having a filing date of May 2, 2008. Each of the above-referenced applications are hereby incorporated by reference in their entirety. 
    
    
     FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     [Not Applicable] 
     MICROFICHE/COPYRIGHT REFERENCE 
     [Not Applicable] 
     BACKGROUND OF THE INVENTION 
     The present invention relates to a gaming system and to a method of gaming. 
     It is known to provide a gaming system which comprises a game controller arranged to randomly display several symbols from a predetermined set of symbols and to determine a game outcome such as a game win based on the displayed symbols. In some arrangements, a win outcome is defined on the basis of occurrence of symbols along defined win lines which may be preselected or selected by a player prior to display of symbols by the gaming system. 
     Such gaming systems may commonly be implemented as a stepper machine provided with reels with each reel carrying several symbols of the set, or a video machine wherein selected symbols are displayed on virtual reels on a graphical display device. 
     However, while such gaming systems provide users with enjoyment, a need exists for alternative gaming systems in order to maintain or increase player enjoyment. 
     BRIEF SUMMARY OF THE INVENTION 
     In accordance with a first aspect of the present invention, there is provided a gaming system comprising: 
     a plurality of display positions disposed in a display area; 
     a symbol selector arranged to select a plurality of symbols for display at respective display positions; 
     an outcome evaluator arranged to determine whether the selected symbols correspond to a winning outcome with reference to at least one of a plurality of defined win lines; 
     wherein each of the defined win lines comprises at least one display position, and at least some of the win lines comprise differing numbers of display positions. 
     In one embodiment, the display positions define a display area of generally diamond shaped configuration. The diamond shape may be regular or irregular. 
     In one embodiment, the display positions define a display area of generally square or rectangular configuration. 
     In one embodiment, the display positions and selected symbols are displayed using a video display. 
     In an alternative embodiment, the gaming system comprises a plurality of physical reels, each reel having an associated set of symbols, and the gaming system being arranged such that at least one symbol from each reel is viewable through the display area. The physical reels may be disposed so as to be rotatable about an inclined axis, for example about an axis disposed approximately 45° relative to horizontal. 
     The gaming system may be arranged to operate in normal game mode wherein at least one base game is implemented and special game mode wherein at least one feature game is implemented. 
     The gaming system may be arranged to commence special game mode when a specific game outcome occurs. In addition or alternatively, the gaming system may be arranged to commence special game mode on the basis of a game event occurring during a game such as display of a particular symbol, in response to player input, based on the amount or type of bet placed, or when a special game is purchased by a player. 
     The gaming system may be implemented as a stand alone gaming machine or across a network. 
     In one embodiment, one or more of the symbol selector, feature implementer, prize allocator and the outcome evaluator is constituted, at least in part, by a processor executing program code stored in a memory. 
     In one embodiment, the gaming system comprises a game play mechanism operable to place a wager and the outcome evaluator evaluates the outcome based on the wager. 
     In accordance with a second aspect of the present invention, there is provided a method of gaming comprising: 
     providing a plurality of display positions in a display area; 
     selecting a plurality of symbols for display at respective display positions; 
     determining whether the selected symbols correspond to a winning outcome with reference to at least one of a plurality of defined win lines; and 
     defining each win line so as to comprise at least one display position, at least some of the win lines including differing numbers of display positions. 
     In accordance with a third aspect of the present invention, there is provided a computer program arranged when loaded into a computer to instruct the computer to operate in accordance with a gaming system comprising: 
     a plurality of display positions disposed in a display area; 
     a symbol selector arranged to select a plurality of symbols for display at respective display positions; 
     an outcome evaluator arranged to determine whether the selected symbols correspond to a winning outcome with reference to at least one of a plurality of defined win lines; 
     wherein each of the defined win lines comprises at least one display position and at least some of the win lines comprise differing numbers of display positions. 
     In accordance with a fourth aspect of the present invention, there is provided a computer readable medium having computer readable program code embodied therein for causing a computer to operate in accordance with a gaming system comprising: 
     a plurality of display positions disposed in a display area; 
     a symbol selector arranged to select a plurality of symbols for display at respective display positions; 
     an outcome evaluator arranged to determine whether the selected symbols correspond to a winning outcome with reference to at least one of a plurality of defined win lines; 
     wherein each of the defined win lines comprises at least one display position and at least some of the win lines comprise differing numbers of display positions. 
     In accordance with a fifth aspect of the present invention, there is provided a data signal having computer readable program code embodied therein for causing a computer to operate in accordance with a gaming system comprising: 
     a plurality of display positions disposed in a display area; 
     a symbol selector arranged to select a plurality of symbols for display at respective display positions; 
     an outcome evaluator arranged to determine whether the selected symbols correspond to a winning outcome with reference to at least one of a plurality of defined win lines; 
     wherein each of the defined win lines comprises at least one display position and at least some of the win lines comprise differing numbers of display positions. 
    
    
     
       BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS 
       The present invention will now be described, by way of example only, with reference to the accompanying drawings, in which: 
         FIG. 1  is a schematic block diagram of core components of a gaming system in accordance with an embodiment of the present invention; 
         FIG. 2  is a schematic block diagram of functional components of a gaming system in accordance with an embodiment of the present invention; 
         FIG. 3  is a diagrammatic representation of a gaming system in accordance with an embodiment of the present invention with the gaming system implemented in the form of a stand alone gaming machine; 
         FIG. 4  is a schematic block diagram of operative components of the gaming machine shown in  FIG. 3 ; 
         FIG. 5  is a schematic block diagram of components of a memory of the gaming machine shown in  FIG. 3 ; 
         FIG. 6  is a schematic diagram of a gaming system in accordance with an alternative embodiment of the present invention with the gaming system implemented over a network; 
         FIG. 7  is a flow diagram illustrating game play of a gaming system in accordance with an embodiment of the present invention; 
         FIG. 8  is a diagrammatic representation of an example display area of a gaming system in accordance with an embodiment of the present invention during implementation of a game; 
         FIG. 9  is a diagrammatic representation of a further example of a display area of a gaming system in accordance with the embodiment shown in  FIG. 8 ; 
         FIG. 10  is a diagrammatic representation of a further example of a display area of a gaming system in accordance with an alternative embodiment of the present invention during implementation of a game; 
         FIG. 11  is a diagrammatic representation of a further example of a display area of a gaming system in accordance with an alternative embodiment of the present invention during implementation of a game; and 
         FIG. 12  is a diagrammatic representation of a further example of a display area of a gaming system in accordance with an alternative embodiment of the present invention during implementation of a game. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present gaming system operates such that at least during a portion of a game implemented by the gaming system, a display area is provided including a plurality of display positions. The display positions define a plurality of win lines, some of which have differing numbers of display positions or game matrix coordinates. In this way, win lines comprising differing numbers of display positions/coordinates/symbols are provided which allows different win possibilities to be provided according to the number of display positions in the win lines. 
     In some embodiments, win lines with differing numbers of display positions are achieved by arranging the display positions so that the display positions together define a generally diamond shaped display area (game matrix), and defining win lines which traverse the display area left to right, right to left or both ways. In other embodiments, the display positions may define a generally square or rectangular shaped display area and win lines defined which extend generally diagonally across the display area. 
     Referring to the drawings, there is shown a schematic block diagram of a gaming system  10  arranged to implement a probabilistic game of the type wherein several symbols from a set of symbols are randomly displayed, and a game outcome is determined on the basis of the displayed symbols. The system may have a single mode of operation or may be of the type including multiple game modes, such as operable in normal game mode wherein a base game is implemented and special game mode wherein a feature game is implemented. 
     With some such probabilistic games, the set of symbols used include standard symbols and function symbols, and the game outcome is determined on the basis of the displayed standard symbols and the function associated with any displayed function symbol. For example, standard symbols may resemble fruit such as apples, pears and bananas with a win outcome being determined when a predetermined number of the same fruit appear on a display along a win line, or are displayed according to defined outcome patterns such as scattered, and so on. The function associated with a function symbol may be for example a wild function wherein display of the function symbol is treated during consideration of the game outcome as any of the standard symbols. A function symbol may be represented as the word “WILD”, a star, or by any other suitable word or symbol. Other functions are also envisaged such as scatter functions, multiplier functions, repeat win functions, jackpot functions and feature commencement functions. 
     Referring to  FIG. 1 , a schematic diagram of core components of a gaming system  10  in accordance with the present embodiment is shown. The core components comprise a player interface  30  and a game controller  32 . The player interface  30  is arranged to enable interaction between a player and the gaming system and for this purpose includes input/output components required for the player to enter instructions and play the game. 
     Components of the player interface  30  may vary but will typically include a credit mechanism  34  to enable a player to input credits and receive payouts, one or more displays  36  which may comprise a touch screen, and a game play mechanism  38  arranged to enable a player to input game play instructions. 
     The game controller  32  is in data communication with the player interface  30  and typically includes a processor  40  arranged to process game play instructions and output game player outcomes to the display  36 . Typically, the game play instructions are stored as program code in a memory  42  that can also be hardwired. It will be understood that in this specification the term “processor” is used to refer generically to any device that can process game play instructions and may include a microprocessor, microcontroller, programmable logic device or other computational device such as a personal computer or a server. 
     A functional diagram illustrating operative components of the game controller  32  is shown in  FIG. 2 . 
     The memory  42  is arranged to store symbols data  14  indicative of a plurality of symbols, in the present example associated with a plurality of reels, function data  16  indicative of one or more functions allocatable to the symbols, and game instruction data  18  indicative of game instructions usable by the gaming machine  10  to control operation of the game. 
     The game controller  32  includes a symbol selector  20  which is arranged to select several symbols from the available symbols  15  for display to a player in a plurality of display positions, in this example by spinning reels containing the symbols and stopping the reels so as to display at least one symbol on each reel. In this example, the selection carried out by the symbol selector  20  is made using a random number generator  22 . 
     It will be appreciated that the random number generator  22  may be of a type which is arranged to generate pseudo random numbers based on a seed number, and that in this specification the term “random” will be understood accordingly to mean truly random or pseudo random. 
     With this embodiment, the game controller  32  also comprises a trigger determiner  24  arranged to determine whether a trigger condition exists, and a feature implementer  25  arranged to cause the gaming system to operate in special mode wherein a feature game is implemented when a trigger condition exists. Such a trigger condition may be display of a particular symbol or combination of symbols corresponding to a winning combination and the selected identifier  15  in this example is applied to the prize associated with the winning combination so as to increase or decrease the prize, or maintain the prize the same. 
     The gaming system may also be arranged so as to operate in normal game mode wherein at least one base game is implemented and special game mode wherein at least one feature game is implemented. The trigger determiner  24  may be arranged so as to commence special game mode based on display of a particular symbol or combination of symbols during normal game mode. 
     In this example, the game controller  32  also comprises a function allocator  27  arranged to select and allocate one or more functions to one or more symbols. Such functions include a wild function, a scatter function, or any other function which may be applied to a symbol or to the game. 
     The game controller  32  also comprises an outcome evaluator  28  which in accordance with the game instructions  18  determines game outcomes based on the symbols selected for display to the player by the symbol selector  20 , and a prize allocator  29  arranged to allocate a prize to a player when a winning outcome exists. 
     In the embodiments described below, the symbol selector  20 , the trigger determiner  24 , the feature implementer  25 , the function allocator  27 , and the outcome evaluator  28 , and the prize allocator  29  are at least partly implemented using the processor  40  and associated software, although it will be understood that other implementations are envisaged. 
     The gaming system  10  can take a number of different forms. 
     In a first form, a player operable gaming device in the form of a stand alone gaming machine is provided wherein all or most components required for implementing the game are present in the 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 device and some of the components required for implementing the game are located remotely relative to the gaming device. For example, a “thick client” architecture may be used wherein part of the game is executed on a player operable gaming terminal 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 terminal 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 device is networked to a device server and the respective functions of the gaming machine and the gaming server are selectively modifiable. For example, the gaming system may operate in stand alone 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. 
     A gaming system in the form of a stand alone gaming machine  50  is illustrated in  FIG. 3 . The gaming machine  50  includes a console  52  having a display  54  on which is displayed representations of a game  56  that can be played by a player. A mid-trim  60  of the gaming machine  50  houses a bank of buttons  62  for enabling a player to interact with the gaming machine, in particular during gameplay. The mid-trim  60  also houses a credit input mechanism  64  which in this example includes a coin input chute  64 A and a bill collector  64 B. Other credit input mechanisms may also be employed, for example, a card reader for reading a smart card, debit card or credit card. 
     A top box  66  may carry artwork  68 , including for example pay tables and details of bonus awards and other information or images relating to the game. Further artwork and/or information may be provided on a front panel  69  of the console  52 . A coin tray  70  is mounted beneath the front panel  69  for dispensing cash payouts from the gaming machine  50 . 
     The display  54  is in the form of a video display unit, particularly a cathode ray tube screen device. Alternatively, the display  54  may be a liquid crystal display, plasma screen, or any other suitable video display unit. The top box  66  may also include a display, for example a video display unit, which may be of the same type as the display  54 , or of a different type. The display  54  may comprise a touch screen usable by a player to interact with the gaming machine, in particular during game play. 
     The display  54  in this example is arranged to display representations of several reels, each reel of which has several associated symbols. Typically 3, 4 or 5 reels are provided. During operation of the game, the reels first appear to rotate then stop with typically three symbols visible on each reel. Game outcomes are determined on the basis of the visible symbols together with any special functions associated with the symbols. 
     A player marketing module (PMM)  72  having a display  74  is connected to the gaming machine  50 . The main purpose of the PMM  72  is to allow the player to interact with a player loyalty system. The PMM has a magnetic card reader for the purpose of reading a player tracking device, for example as part of a loyalty program. However other reading devices may be employed and 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. In this example, the PMM  62  is a Sentinel III device produced by Aristocrat Technologies Pty Ltd. 
       FIG. 4  shows a block diagram of operative components of a gaming device  100  which may be the same as or different to the gaming machine shown in  FIG. 3 . 
     The gaming machine  100  includes a game controller  101  having a processor  102 . Instructions and data to control operation of the processor  102  in accordance with the present invention 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 . 
       FIG. 5  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. 
     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 a player interface  120  of the gaming machine  100 , the player interface  120  having several peripheral devices. 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 . 
     In the example shown in  FIG. 4 , the peripheral devices that communicate with the game controller  101  comprise one or more displays  106 , a touch screen and/or bank of buttons  107 , 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. 
     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 central controller, server or database and receive data or commands from the central controller, server or database. 
     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  may be provided remotely from the game controller  101 . 
       FIG. 6  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, a LAN or a WAN. In this example, three banks  203  of two gaming machines  202  are connected to the network  201 . The gaming machines  202  provide a player operable interface and may be the same as the gaming machines  40 ,  100  shown in  FIGS. 3 and 4 , or may have simplified functionality depending on the requirements for implementing game play. While banks  203  of two gaming machines are illustrated in  FIG. 6 , banks of one, three or more gaming machines are also envisaged. 
     One or more displays  204  may also be connected to the network  201 . The displays  204  may, for example, 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, a 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  205  and the gaming machine  202  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 monitor and carry out the Jackpot game. 
     In a variation of the above thick client embodiment, the gaming machine  202  may implement the game, with the game server  205  functioning merely to serve data indicative of a game to the gaming machine  202  for implementation. 
     With this implementation, a data signal containing a computer program usable by the client terminal to implement the gaming system may be transferred from the game server to the client terminal, for example in response to a request by the client terminal. 
     In a thin client embodiment, the game server  205  implements most or all of the game played by a player using a gaming device in the form of a gaming terminal  202  and the gaming terminal  202  essentially provides only the player interface. With this embodiment, the game server  205  provides the game controller. The gaming terminal will receive player instructions, and pass the instructions to the game server which will process them and return game play outcomes to the gaming device for display. In a thin client embodiment, the gaming devices could be computer terminals, e.g. PCs running software that provides a player interface operable using standard computer input and output components. 
     Servers are also typically provided to assist in the administration of the gaming system  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 monitor the network  201  and the devices connected to the network. 
     The gaming system  200  may communicate with other gaming systems, other local networks such as a corporate network, and/or a wide area network such as the Internet, for example through a firewall  211 . 
     A loyalty program server  212  may also be provided. 
     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 number generator engine. Alternatively, a separate random number generator server could be provided. 
     Examples of specific implementations of the gaming system will now be described in relation to a stand alone gaming machine  10  although it will be understood that implementation may also be carried out using other gaming system architectures such as a network architecture of the type shown in  FIG. 6 . 
     In this example, the gaming system is operable in normal game mode and special game mode and the gaming system comprises five reels, each of which has an associated set of symbols. 
     The reels comprise standard symbols and optionally one or more function symbols and win outcomes are determined on the basis of the symbols visible at the display positions when the reels stop rotating. 
     Typically, a player will purchase or otherwise obtain win entitlements such as several win lines which are used in the game to determine win outcomes. If the displayed symbols on the reels have symbols associated with a winning combination such as disposed on a win line, the player wins a prize. 
     The gaming system may be arranged to commence special game mode when a predetermined game outcome occurs, and special game mode may comprise one or more feature games. Special game mode may commence automatically on the basis of a game event occurring during a game such as display of a particular symbol, based on game outcomes determined by the gaming system, or may be prompted by a player pressing a button on the gaming system after the player has identified that a game outcome corresponding to special game mode requirements has occurred. 
     The gaming system may also be arranged so as to determine eligibility for special game mode, for example based on the amount or type of bet placed, based on certain time periods and so on. 
     Special game mode may also be arranged to commence when a special game is purchased by a player. 
     The system and method may also be configured to provide for “scatter” wins for symbols appearing anywhere in the game display matrix. 
     A specific example will now be described in relation to flow diagram  250  shown in  FIG. 7  which illustrates steps  252  to  266  of a method of gaming implemented by the gaming system according to the present embodiment. 
     An example display area  300  of an embodiment of the invention is shown in  FIG. 8 . In this example, the display matrix includes 9 display coordinates or positions  302  arranged in a generally diamond shaped configuration. Symbols  304  shown in the display positions are arranged in vertically oriented first  306 , second  308 , third  310 , fourth  312  and fifth  314  reels, the first reel  306  having 1 display position  304 , the second reel having 2 display positions  304 , the third reel  310  having 3 display positions  304 , the fourth reel  312  having 2 display positions  304 , and the fifth reel  314  having 1 display position  304 . In this example, multiple win lines (sometimes called pay lines) are defined, including a first win line  316  having 5 display positions, a second win line  318  having 4 display positions  304 , a third win line  320  having 3 display positions  304 , a fourth win line  322  having 5 display positions  304 , and a fifth win line  324  having 5 display positions  304 . 
     It will be understood that since some win lines have different numbers of display positions, the winning outcomes available will be different for the win lines having 3, 4 or 5 display positions. 
     Since the win possibilities are different for win lines including 3, 4 or 5 symbols, the gaming system may be arranged such that for example the third win line  320  which comprises 3 display positions is cheaper for a player to purchase than the first win line  316  which comprises 5 display positions. This reflects the greater potential prize that a player could achieve with a 5 display position win line than with a 3 display position win line. Alternatively the award schedule for the second and third win lines  318 ,  320  may be different because of the diminished number of included display positions. Thus, in one configuration, the award schedule may be configured to offer different awards based upon the number of display positions associated therewith. 
     In the present example, a winning outcome including 4 ACE symbols (2 WILD (W) symbols and 2 ACE (A) symbols) occurs on the first line  316  and, accordingly, a prize associated with a win comprising 4 symbols on the first line  316  is awarded to the player. The player may also be awarded for 3 Queen (Q) symbols on the second win line  318 . 
     A further example winning outcome is shown in  FIG. 9 . With this example, a winning outcome including 3 ACE symbols (2 ACE symbols and 1 WILD symbol) occurs on the third line  320  and, accordingly, a prize associated with a win comprising 3 symbols on the third line  320  is awarded to the player. 
     An example display area  400  of a further embodiment of the invention is shown in  FIG. 10 . Like and similar features are indicated with like reference numerals. In this example, the display area includes 12 display positions  302  arranged in a generally irregular diamond shaped configuration. Symbols  304  shown in the display positions are arranged in first  402 , second  404 , third  406 , fourth  408 , fifth  410  and sixth  412  reels, the first reel  402  having 1 display position  302 , the second reel  404  having 2 display positions  302 , the third reel  406  having 3 display positions  302 , the fourth reel  408  having 3 display positions  302 , the fifth reel  410  having 2 display positions  302 , and the sixth reel having 1 display position  302 . In this example, multiple win lines are defined, some of which include 4 display positions, some of which include 5 display positions, and some of which include 6 display positions. 
     In the present example, a winning outcome including 5 QUEEN symbols (1 WILD symbol and 4 QUEEN symbols) occurs on a win line  420  and, accordingly, a prize associated with a win comprising 5 QUEEN symbols on the win line  420  is awarded to the player. 
     A further example display area  500  of an embodiment of the invention is shown in  FIG. 11 . Like and similar features are indicated with like reference numerals. In this example, the display area includes 9 display positions  302  arranged in a generally square shaped configuration. Symbols  304  shown in the display positions are arranged in first  502 , second  504  and third reels  506 , each reel having 3 display positions  304 . In this example, multiple win lines are defined which extend generally diagonally across the display area  400 , including a first win line  510  including 3 display positions and a second win line  512  including 5 display positions  304 . 
     As with the above described embodiments, since some win lines have different numbers of display positions, the winning outcomes available will be different for the win lines having 3, 4 or 5 display positions. 
     In the present example, no winning outcome exists. 
     The above embodiments described in relation to  FIGS. 8 to 11  are implemented using a video display such that the symbols, display positions and reel movements are generated on the video display. However, it will be understood that other variations are possible. For example, as shown in  FIG. 12 , in an embodiment wherein the display positions define a generally diamond shaped display area, several physical, electro-mechanical reels  602  disposed so as to rotate about an inclined axis may be provided. 
     The gaming system in this example is arranged to operate in normal game mode and special game mode. Special game mode commences when a trigger condition exists and during special game mode at least one feature game is implemented. 
     The gaming system may be arranged so that a game with multiple win lines, at least some of which have differing numbers of display positions, is implemented during both normal game mode and special game mode or only as part of a feature game during special game mode. 
     In an alternative arrangement, the gaming system is arranged to operate in normal game mode only. In an alternative embodiment a traditional three reel of five reel base game may be offered with the diamond shaped reels of  FIGS. 8-10 and 12  offered during a free spin or second, feature game. 
     It will be appreciated that while the above embodiments are described in relation to a display area of generally diamond or square configuration, it will be understood that many variations are possible to the extent that any shape display area may be provided, the important aspect being that win lines having differing numbers of display positions are defined. 
     In the claims of this application and in the description of the invention, except where the context requires otherwise due to express language or necessary implication, the words “comprise” or variations such as “comprises” or “comprising” are 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. 
     It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country. 
     Modifications and variations as would be apparent to a skilled addressee are deemed to be within the scope of the present invention.