AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION Innovation Patent Applicant: Aristocrat Technologies Australia Pty Limited Invention Title: GAMING MACHINE WITH BUY FEATURE GAMES The following statement is a full description of this invention, including the best method for performing it known to me/us: - 2 GAMING MACHINE WITH BUY FEATURE GAMES Related Case 5 This application is a divisional application of Australian Innovation Patent 2011100149 and relates to a further invention described but not claimed in that patent. The disclosure of innovation patent 2011100149 is incorporated herein by reference. 10 Field The present invention relates to a gaming machine, a method of gaming, a gaming system and a game controller. 15 Background Players regularly playing gaming machines need to have their interests maintained. Therefore, it is necessary 20 for manufacturers of these machines to develop inventive game features which add interest to the games provided on such machines in order to keep the players entertained and willing to continue to play the games. 25 There is a continuous trade-off between what the players of the machines want and what the operators of the machines want from the machines. Naturally, operators want the players to stake more money per game so that the overall turnover is higher. Conversely, players will not 30 do this unless they feel that they are getting more for the extra money that they are betting. Further, as the range of machines and games increases, it is becoming increasingly important to offer more options 35 to the players. The more options that are available in one machine, the easier it is to maintain the player's interest and the easier it is for players to be able to 2852428_1 (GHMatters) P83653AU.3 28/09/11 - 3 gain access to a machine that will offer them exactly the game that they want. To date, most types of video gaming machines which are 5 available to players offer limited options. At best, a range of bet sizes and paylines upon which the players can bet are offered. Certain machines also offer a double-up option available after a win while other machines have various ranges of pay tables particularly for higher bets. 10 Summary In one aspect, the invention provides a game controller for a gaming system, the game controller arranged to 15 control operation of the gaming system and responsive initiation of a play of the game to implement the play of the game by generating at least one game outcome based on game play rules stored in a memory and evaluating the game outcome to determine whether a player is entitled to one 20 or more awards based on the at least one game outcome and to control a display to display each game outcome by displaying a plurality of symbols at a plurality of display positions on the display, the game controller arranged to control which of the game play rules are used 25 to generate the at least one game outcome in the play of the game based at least on whether the wager made during initiation of the play of the game is a first, second or third wager, the first wager consisting of a base wager, and the second and third wagers each consisting of a base 30 wager portion and an additional wager portion, the third wager having a higher ratio of the additional wager portion to the base wager portion than the second wager such that upon said second wager being made and at least one 35 designated event associated with the second wager occurring in the play of the game, the game controller employing game rules from the memory corresponding to the 28524281 (GHMatters) P83653.AU.3 28/09/11 - 4 second wager so as to provide a first additional benefit to the player relative to when the first wager is made, and upon said third wager being made and at least one 5 designated event associated with the third wager occurring in the play of the game, the game controller employing game rules from the memory corresponding to the third wager so as to provide a second additional benefit to the player relative to when the first wager is made, the game 10 rules corresponding to the third wager being different to the game rules corresponding to the second wager such that the second additional benefit is a greater benefit than the first additional benefit. 15 In an embodiment, a common designated event is associated with both the second and third wagers. In an embodiment, the common designated event is a trigger event which triggers the game controller to generate at 20 least one additional game outcome. In an embodiment, the game controller generates a single game outcome in a game in which the trigger event does not occur. 25 In an embodiment, the game controller generates a plurality of additional game outcomes in response to the trigger event and provides a greater benefit for the third wager by generating more additional game outcomes when the 30 trigger event occurs in respect of the third wager than in respect of the second wager. In an embodiment, the game controller also generates a plurality of additional game outcomes upon the trigger 35 event occurring in respect of the first wager and the first and second additional benefits comprise different numbers of additional game outcomes. 28524281 (GHMatters) P83653AU.3 28/09/11 - 5 In an embodiment, the game is a spinning reel game in which the game controller generates a game outcome by controlling the reels to be displayed as spinning on the 5 display and determining which symbols of a plurality of reels will be displayed to a player in the plurality of display positions on the display when the reels stop, and evaluates the displayed symbols to determine whether the player is entitled to an award. 10 In an embodiment, each additional game outcome comprises re-spinning each of the reels to determine a further set of symbols of the plurality of reels to be displayed and evaluating the further set of symbols to determine whether 15 the player is entitled to an award. In an embodiment, each additional game outcome comprises re-spinning a subset of the reels to determine a further set of symbols to be displayed and evaluating the further 20 set of symbols to determine whether the player is entitled to an award. In another aspect, the invention provides a method of gaming in a gaming system comprising: 25 receiving one of a plurality of possible wagers on a play of the game via at least one input device and initiating the play of the game, the plurality of possible wagers comprising a first wager consisting of a base wager, and second and third wagers each consisting of a 30 base wager portion and an additional wager portion, the third wager having a higher ratio of the additional wager portion to the base wager portion than the second wager; controlling operation of the gaming system responsive to the at least one input device to implement the play of 35 the game by generating at least one game outcome based on game play rules stored in a memory and evaluating the game outcome to determine whether the player is entitled to one 2852428_1 (GHMatters) P83653.AU.3 28/09/11 - 6 or more awards based on the at least one game outcome; displaying each game outcome on a display of the gaming system, the display of each game outcome including displaying a plurality of symbols at a plurality of 5 display positions on the display, controlling which of the game play rules are used to generate the at least one game outcome in the play of the game based at least on whether the wager in respect of the play of the game is the first, second or third wager, by 10 upon said second wager being made and at least one designated event associated with the second wager occurring in the play of the game, providing a first additional benefit to the player relative to when the first wager is made, and 15 upon said third wager being made and at least one designated event associated with the third wager occurring in the play of the game, providing a second additional benefit to the player relative to when the first wager is made, the second additional benefit being a greater 20 benefit than the first additional benefit. In an embodiment, a common designated event is associated with both the second and third wagers. 25 In an embodiment, the common designated event is a trigger event which triggers the generation of at least one additional game outcome. In an embodiment, the method comprises generating a single 30 game outcome in a game in which the trigger event does not occur. In an embodiment, the method comprises generating a plurality of additional game outcomes in response to the 35 trigger event and, wherein a greater benefit for the third wager is provided by generating more additional game outcomes when the trigger event occurs in respect of the 28524281 (GHMatters) P83653.AU.3 28/09/11 -7 third wager than in respect of the second wager. In an embodiment, the method comprises generating a plurality of additional game outcomes upon the trigger 5 event occurring in respect of the first wager and the first and second additional benefits comprise different numbers of additional game outcomes. In an embodiment, the game is a spinning reel game and in 10 a game outcome is generated by controlling the reels to be displayed as spinning on the display, determining which symbols of a plurality of reels will be displayed to a player in the plurality of display positions on the display when the reels stop, and evaluating the displayed 15 symbols to determine whether the player is entitled to an award. In an embodiment, each additional game outcome comprises re-spinning each of the reels to determine a further set 20 of symbols of the plurality of reels to be displayed and evaluating the further set of symbols to determine whether the player is entitled to an award. In an embodiment, each additional game outcome comprises 25 re-spinning a subset of the reels to determine a further set of symbols to be displayed and evaluating the further set of symbols to determine whether the player is entitled to an award. 30 In an embodiment, each of the plurality of possible wagers are associated with respective ones of a plurality of buttons and receiving the wager comprises determining which one of the buttons has been used by the player. 35 In another aspect, the invention provides computer program code which when executed implements the above method. 28524281 (GHMatters) P83653AU.3 28/09/11 -8 In another aspect, the invention provides a gaming system comprising: at least one input device operable by a player to place one of a plurality of possible wagers on a play of 5 the game and initiate the play of the game, the plurality of possible wagers comprising a first wager consisting of a base wager, and second and third wagers each consisting of a base wager portion and an additional wager portion, the third wager having a higher ratio of the additional 10 wager portion to the base wager portion than the second wager ; a game controller arranged to control operation of the gaming system and responsive to the at least one input device to implement the play of the game by generating at 15 least one game outcome based on game play rules stored in a memory and evaluating the game outcome to determine whether the player is entitled to one or more awards based on the at least one game outcome; a display that displays each game outcome under the 20 control of the game controller, the display of each game outcome including displaying a plurality of symbols at a plurality of display positions on the display, the game controller arranged to control which of the game play rules are used to generate the at least one game 25 outcome in the play of the game based at least on whether the wager in respect of the play of the game is the first, second or third wager, such that upon said second wager being made and at least one designated event associated with the second wager 30 occurring in the play of the game, the game controller provides a first additional benefit to the player relative to when the first wager is made, and upon said third wager being made and at least one designated event associated with the third wager occurring 35 in the play of the game, the game controller provides a second additional benefit to the player relative to when the first wager is made, the second additional benefit 28524281 (GHMatters) P83653AU.3 28/09/11 -9 being a greater benefit than the first additional benefit. In an embodiment, a common designated event is associated with both the second and third wagers. 5 In an embodiment, the common designated event is a trigger event which triggers the game controller to generate at least one additional game outcome. 10 In an embodiment, the game controller generates a single game outcome in a game in which the trigger event does not occur. In an embodiment, the game controller generates a 15 plurality of additional game outcomes in response to the trigger event and provides a greater benefit for the third wager by generating more additional game outcomes when the trigger event occurs in respect of the third wager than in respect of the second wager. 20 In an embodiment, the game controller also generates a plurality of additional game outcomes upon the trigger event occurring in respect of the first wager and the first and second additional benefits comprise different 25 numbers of additional game outcomes. In an embodiment, the game is a spinning reel game in which the game controller generates a game outcome by controlling the reels to be displayed as spinning on the 30 display and determining which symbols of a plurality of reels will be displayed to a player in the plurality of display positions on the display when the reels stop, and evaluates the displayed symbols to determine whether the player is entitled to an award. 35 In an embodiment, each additional game outcome comprises re-spinning each of the reels to determine a further set 28524281 (GHMatters) P83653.AU.3 28/09/11 - 10 of symbols of the plurality of reels to be displayed and evaluating the further set of symbols to determine whether the player is entitled to an award. 5 In an embodiment, each additional game outcome comprises re-spinning a subset of the reels to determine a further set of symbols to be displayed and evaluating the further set of symbols to determine whether the player is entitled to an award. 10 In an embodiment, the at least one input device comprises a plurality of buttons each associated with a different one of the plurality of possible wagers such that the player places the wager with a single one of the buttons. 15 In an embodiment, the at least one input device is a touch screen displaying a plurality of virtual buttons. In an embodiment, the buttons are electromechanical 20 buttons. Brief Description of Drawings The invention is now described by way of example with 25 reference to the accompanying diagrammatic drawings in which: Figure 1 is a block diagram of the core components of a gaming system; 30 Figure 2 is a perspective view of a stand alone gaming machine; Figure 3 is a block diagram of the functional components 35 of a gaming machine; Figure 4 is a schematic diagram of the functional 2852428_1 (GHMatters) P83653AU.3 28/09/11 - 11 components of a memory; Figure 5 is a schematic diagram of a network gaming system; and 5 Figure 6 is a further block diagram of a gaming system. Detailed Description of the Drawings 10 Referring to Figures 1 to 6, there are shown embodiments of a gaming system 100 having a game controller 160 arranged to implement a game where certain wagers provide an additional benefit to a player when a designated event associated with the wager occurs. 15 Such wagers include a base wager portion and an additional wager portion. That is, the additional wager introduces eligibility to the additional benefit and the additional wager portion is a dedicated bet towards the additional benefit. 20 There are at least two different wagers which have additional wager portions in different ratios to the base wager portion such that at least one wager has a relatively larger additional wager portion. 25 Advantageously, the gaming system operates such that a greater additional benefit is associated with the wager having relatively larger additional wager portion. The gaming system 100 can take a number of different 30 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. 35 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 2852428_1 (GHMatters) P83653AU.3 28/09/11 - 12 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 5 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 10 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 15 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 stand alone gaming machine mode, "thick client" mode or "thin client" mode 20 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 100 has 25 several core components. At the broadest level, the core components are a player interface 150 and a game controller 160 as illustrated in Figure 1. The player interface is arranged to enable manual interaction between a player and the gaming system and for this purpose 30 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 35 embodiment to embodiment but will typically include a credit mechanism 152 to enable a player to input credits and receive payouts, one or more displays 154, a game play 2852428_1 (GHMatters) P83653.AU.3 28/09/11 - 13 mechanism 156 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 158. 5 The game controller 160 is in data communication with the player interface and typically includes a processor 162 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 10 program code in a memory 164 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 15 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 20 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 25 gate array (FPGA). A gaming system in the form of a stand alone gaming machine 110 is illustrated in Figure 2. The gaming machine 110 includes a console 112 having a display 114 on 30 which are displayed representations of a game 116 that can be played by a player. A mid-trim 120 of the gaming machine 110 houses a bank of electromechanical buttons 122 for enabling a player to interact with the gaming machine, in particular during game play. The mid-trim 120 also 35 houses a credit input mechanism 124 which in this example includes a coin input chute 124A and a bill collector 124B. Other credit input mechanisms may also be employed, 2852428_1 (GHMatters) P83653AU.3 28/09/11 - 14 for example, a card reader for reading a smart card, debit card or credit card. Other gaming machines may configure for ticket in such that they have a ticket reader for reading tickets having a value and crediting the player 5 based on the face value of the ticker. A player marketing module (not shown) having a reading device may also be provided 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 10 drive or any other portable storage medium capable of being read by the reading device. In some embodiments, the player marketing module may provide an additional credit mechanism, either by transferring credits to the gaming machine from credits stored on the player tracking 15 device or by transferring credits from a player account in data communication with the player marketing module. A top box 126 may carry artwork 128, including for example pay tables and details of bonus awards and other 20 information or images relating to the game. Further artwork and/or information may be provided on a front panel 129 of the console 112. A coin tray 130 is mounted beneath the front panel 129 for dispensing cash payouts from the gaming machine 110. 25 The display 114 shown in Figure 2 is in the form of a video display unit, particularly a cathode ray tube screen device. Alternatively, the display 114 may be a liquid crystal display, plasma screen, any other suitable video 30 display unit, or the visible portion of an electromechanical device. The top box 126 may also include a display, for example a video display unit, which may be of the same type as the display 114, or of a different type. 35 Figure 3 shows a block diagram of operative components of a typical gaming machine which may be the same as or 2852428_1 (GHMatters) P83653.AU.3 28/09/11 - 15 different to the gaming machine of Figure 2. The gaming machine 300 includes a game controller 301 having a processor 302 mounted on a circuit board. 5 Instructions and data to control operation of the processor 302 are stored in a memory 303, which is in data communication with the processor 302. Typically, the gaming machine 300 will include both volatile and non volatile memory and more than one of each type of memory, 10 with such memories being collectively represented by the memory 303. The gaming machine has hardware meters 304 for purposes including ensuring regulatory compliance and monitoring 15 player credit, an input/output (I/0) interface 305 for communicating with peripheral devices of the gaming machine 300. The input/output interface 305 and/or the peripheral devices may be intelligent devices with their own memory for storing associated instructions and data 20 for use with the input/output interface or the peripheral devices. A random number generator module 313 generates random numbers for use by the processor 302. Persons skilled in the art will appreciate that the reference to random numbers includes pseudo-random numbers. 25 In the example shown in Figure 3, a player interface 320 includes peripheral devices that communicate with the game controller 301 including one or more displays 106, a touch screen and/or buttons 307 (which provide a game play 30 mechanism), a card and/or ticket reader 308, a printer 309, a bill acceptor and/or coin input mechanism 310 and a coin output mechanism 311. Additional hardware may be included as part of the gaming machine 300, or hardware may be omitted as required for the specific 35 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 2852428_1 (GHMatters) P83653.AU.3 28/09/11 - 16 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 5 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. 10 In addition, the gaming machine 300 may include a communications interface, for example a network card 312. The network card may, for example, send status information, accounting information or other information to a bonus controller, central controller, server or 15 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 20 communication with one or more of the above devices and communicate with it on behalf of the gaming machine. Figure 4 shows a block diagram of the main components of an exemplary memory 303. The memory 303 includes RAM 25 303A, EPROM 303B and a mass storage device 303C. The PAM 303A typically temporarily holds program files for execution by the processor 302 and related data. The EPROM 303B may be a boot ROM device and/or may contain some system or game related code. The mass storage device 30 303C is typically used to store game programs, the integrity of which may be verified and/or authenticated by the processor 302 using protected code from the EPROM 303B or elsewhere. 35 It is also possible for the operative components of the gaming machine 300 to be distributed, for example input/output devices 306,307,308,309,310,311 to be 28524281 (GHMatters) P83653AU.3 28/09/11 - 17 provided remotely from the game controller 301. Figure 5 shows a gaming system 200 in accordance with an alternative embodiment. The gaming system 200 includes a 5 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 Figure 5, are connected to the network 201. The gaming machines 202 provide a player operable interface and may be the same as the gaming 10 machines 110,300 shown in Figures 11 and 12, or may have simplified functionality depending on the requirements for implementing game play. While banks 203 of two gaming machines are illustrated in Figure 5, banks of one, three or more gaming machines are also envisaged. 15 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 20 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 25 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 30 management server 206 may manage storage of game programs and associated data for downloading or access by the gaming devices 202 in a database 206A. Typically, if the gaming system enables players to participate in a Jackpot game, a Jackpot server 207 will be provided to perform 35 accounting functions for the Jackpot game. A loyalty program server 212 may also be provided. 28524281 (GHMatters) P83653AU.3 28/09/11 - 18 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, 5 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 10 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 15 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 20 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. 25 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. 30 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 35 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. 28524281 (GHMatters) P83653.AU.3 28/0911 - 19 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 5 may run a plurality of different games as required by the terminals. Figure 6, shows an example of a gaming system 100, where an additional benefit may be provided to the player during 10 the play of a feature game depending on the wager which the player places. In Figure 6, the processor 162 of game controller 60 is shown implementing a number of modules based on program code stored in memory 164. Persons skilled in the art will appreciate that various of the 15 modules could be implemented in some other way, for example by a dedicated circuit. Player interface 150, comprises a display 154, a speaker 158, a credit mechanism 152 and a game play mechanism 156. The player operates the game play mechanism 156 to specify one of five 20 different possible wagers by pressing a button 156A, 156B, 156C, 156D, 156E associated with respective ones of Wager A, Wager B, Wager C, Wager D and Wager E as summarised in Table 1. 2B52428_1 (GHMatters) P83653.AU.3 28/09111 -20 4J c M~ 44W 44 44 434 1 W W04 H 4.4 441 40 0 D z P4 w 4 r 02 0 0 5 40 0 0 4.) 0 U0 O D 0 0 Nt N N- m 4 . C 4)4 4.) 4) 0 O ~ ~ 4 4) 0 J 41 V 0 0V 4. A 4) 0 w C '0 4 64 UW 1 4) 1W 1 4)4 41 + 44 c 4 I) - H -H 0d + + + + M 4 4 V 4J W) W, *4 $4- 64 14 O 00 0 0 0W o c4 o4 14 14 64 N1 4 $4 W W a)W 0 0 0 0 0)) 02 02 - 21 Table 1, shows five wagers which the player may place when playing twenty lines in a twenty play line game. Wager A has only a "standard" or base portion whereas Wagers B-E each have base portions and an "ante" or additional 5 potions. It will be apparent that the relative proportion of the additional wager portion increases from Wager B-E as does the additional benefit in the form of a designated number of additional "free games" during a feature game. That is, in the embodiment, there is a base number of free 10 games and these are added to if one of Wagers B-E is made. In this respect, persons skilled in the art will appreciate that the base game is a part of the game which is carried out each time the player makes a wager and 15 initiates a play of the game whereas a feature game is a part of the game which will only be carried out occasionally upon a trigger condition being met. That is, a feature game involves some additional element of game play which only occurs when a trigger condition is met. 20 Here, the feature game is in the form of "free games" which in the art means that a series of games like the base game are carried out for the player before the player needs to place a further wager and initiate play of the gaming machine again. In the embodiment, the game is a 25 spinning reel game, and the free games are conducted by spinning each reel again, and evaluating the displayed symbols when then reels stop to determine whether the player is entitled to an award. Persons skilled in the art, will appreciate that the concept of "free games" can 30 include games where there is some modification to the game rules relative to the base game, for example, a multiplier is applied to awards, a symbol performs an additional function, the symbol set is changed etc. Persons skilled in the art, will also appreciate that other feature games 35 can be employed including other games where a series of free game events are awarded such as re-spins (where some reels are held while others are re-spun); or "second 28524281 (GHMatters) P83653.AU.3 28/09/11 - 22 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. The additional benefit provided to the player can be designed in accordance with 5 the game, for example, in a pick a box game the additional benefit may be an entitlement to additional selections. In the example of Table 1, each of Wagers A-E are associated with a player playing twenty lines of a twenty 10 line game and the player is only allowed to place a wager including an additional wager portion if playing all twenty lines. Persons skilled in the art will appreciate that in other embodiments there may be other wagers associated with different numbers of win lines. Such win 15 lines are 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. 20 Depending on the implementation, the player's entitlement to winning outcomes may not strictly limited to the lines they have selected, for example, "scatter" pays are awarded independently of a players selection of pay lines and are an inherent part of the win entitlement. 25 The outcome generator 622 operates in response to the player's operation of game play mechanism 56 to place the wager and initiate a play of the game and generates a game outcome which is then be evaluated by outcome evaluator 30 623. The first part of forming the game outcome is for the outcome generator to select symbols from a set of symbols specified by symbol data 641 using random number generator 621. The selected symbols are advised to the display controller 626 which causes them to be displayed 35 on display 154 at a set of display positions. In the embodiment of a spinning-reel game, the symbol data 28524281 (GHMatters) P83653.AU 3 28/09/11 - 23 641 can specify a sequence of symbols for each reel such that the outcome generator can select all of the symbols by selecting a stopping position in the sequence. In one example, three symbols of each of five reels may be 5 displayed such that symbols are displayed at fifteen display positions on display 154. It is known to use a probability table stored in memory 164 to vary the odds of a particular stop position being selected. Other techniques can be used to control the odds of particular 10 outcomes occurring to thereby control the return to player of the game. The outcome evaluator 623 evaluates the displayed symbols by comparing the symbols on the win lines to symbol 15 combinations stored in the pay table 643 to determine whether the player has one or more winning outcomes which entitles the player to an award of credits. Any award of credits is placed on a win meter shown on the display and meter data 645 updated accordingly. As part of the 20 evaluation, outcome evaluator 623 also determines from the outcome whether a designated event has occurred and as such whether the additional benefit corresponding to the additional wager should be provided. In this embodiment, the evaluation is by a trigger monitor 623A determining 25 whether the symbols selected by outcome generator 622 include a trigger condition 643, e.g. three scattered designated symbols. In other embodiments, the designated event may be the occurrence of a specific symbol in the game, be caused by another connected system, based on 30 turnover, based on a random evaluation etc. Once the trigger monitor determines that the trigger condition is met, the feature controller 624 is activated to carry out the free games. The feature controller 624 35 has a rule selector 624A which determines which of Rules A to E 642A-642E are to be employed from game rule data 642 based on which of Wagers A to E has been placed. The 2852428_1 (GHMatters) P83653.AU.3 28/09/11 - 24 feature controller then conducts the relevant number of free games by controlling the outcome generator 622 to generate a series of outcomes and the outcome evaluator 623 to evaluate each of these outcomes. 5 It will be appreciated that in the above embodiment, there is a common designated event which acts as the trigger condition, in other embodiments there may be different designated events depending on the selected wager. In 10 such an embodiment, the rule selector may not be part of the feature controller 624, for example, it could be part of the trigger monitor. In such an embodiment, the rule selection may occur at a different part of the game, for example when the wager is made. Indeed, the rule 15 selection may be made at any suitable time in any embodiment to ensure the correct rule is implemented. It will be appreciated that the invention also provides a method and that at least part of the method will be 20 implemented digitally by a processor. Persons skilled in the art will also appreciate that the method could 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 25 memory (for example, that could replace part of memory 103) or as a data signal (for example, by transmitting it from a server). Persons skilled in the art, will appreciate that program code provides a series of instructions executable by the processor. 30 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 35 embodiments of the invention can be employed to form further embodiments. For example, the above embodiment describes a player selecting win lines, in other 2852428_1 (GHMatters) P83653AU.3 28/09/11 - 25 embodiments, the player select 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 5 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 10 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 centre row 15 are used for non-selected reels. As a result, 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 20 the non-selected reels. As a result for five reels and fifteen display positions there are 243 ways to win. Further some embodiments allow free games to be re triggered if the trigger condition is met during the free 25 game and such re-triggers could be incorporated into the above embodiments. It is to be understood that, if any prior art is referred to herein, such reference does not constitute an admission 30 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 35 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, 2852428_1 (GHMatters) P83653AU.3 28/09/11 - 26 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. 2852428_1 (GHMatters) P83653AU.3 28/09/11