AU2012261551A1 - A gaming system, a method of gaming and an additional game controller - Google Patents

Abstract

A method of gaming comprising: determining which of a plurality of gaming devices, each operable for independent 5 play of one or more games, are eligible for an additional game; initiating an additional game; and determining in response to initiation of the additional game, which eligible gaming devices will participate in the initiated additional game, the determination including a random 10 determination in respect of at least one of the eligible gaming devices to determine whether the respective eligible gaming device will participate in the additional game. 3919520_1 (GHMatters) P80217.AU.2 6/12/12

Description

Title A GAMING SYSTEM, A METHOD OF GAMING AND AN ADDITIONAL GAME CONTROLLER 5 Related Application This application is a divisional application of Australian application no. 2010202165, the disclosure of which is 10 incorporated herein by reference. Field The present invention relates to a gaming system, a method 15 of gaming and an additional game controller. Background In some gaming systems, a player of an individual gaming 20 machine can qualify to play a bonus game conducted by another gaming apparatus. For example, a particular gaming outcome may entitle the player to the bonus game. In other gaming systems a plurality of players may qualify 25 to play a bonus game where players compete against one another, with one or more players receiving an award based on their placing in the bonus game. While such gaming systems provide players with enjoyment, 30 a need exists for alternative gaming systems in order to maintain or increase player enjoyment. Summary of the Invention 35 In a first aspect, the invention provides a method of gaming comprising: determining which of a plurality of gaming devices, 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 2 each operable for independent play of one or more games, are eligible for an additional game; initiating an additional game; and determining in response to initiation of the 5 additional game, which eligible gaming devices will participate in the initiated additional game, the determination including a random determination in respect of at least one of the eligible gaming devices to determine whether the respective eligible gaming device 10 will participate in the additional game. In an embodiment, the random determination is conducted in respect of all of the eligible gaming devices. 15 In an embodiment, at least one gaming device is determined to participate without being subject to the random determination. In an embodiment, a gaming device which caused the 20 additional game to initiate is determined to participate without being subject to the random determination. In an embodiment, at least one random determination is weighted to provide at least one gaming device with a 25 greater probability of being a participating gaming device relative to at least one other gaming device. In an embodiment, the additional game is initiated in response to occurrence of a trigger event. 30 In an embodiment, the trigger event occurs on one of the eligible gaming devices. In an embodiment, the method comprises determining which 35 of the gaming devices are eligible gaming devices based on which gaming device have been active in a designated period. 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 3 In an embodiment, the method comprises determining which of the gaming devices are eligible gaming devices based on whether a designated wager has been made. 5 In an embodiment, the method comprises determining which of the gaming devices are eligible gaming devices by deeming each of a plurality of designated gaming devices to be an eligible gaming device. 10 In an embodiment, the method comprises conducting separate additional games for each gaming device which is determined to participate. 15 In an embodiment, the method comprises conducting a single additional game for all of the gaming devices which are determined to participate, each gaming device operable for independent play of one or more games 20 In an embodiment, the probability of at least one outcome of the additional game is controlled such that at least one gaming device has a higher probability of winning the additional game than at least one other gaming device. 25 In an embodiment, the probability is controlled in favour of a gaming device which caused the additional game to initiate. In a second aspect, the invention provides a gaming system 30 comprising: a plurality of gaming devices, each gaming device operable for independent play of one or more games; and an additional game controller in data communication with the gaming devices, the additional game controller 35 configured to determine, in response to initiation of the additional game, which of the plurality of gaming devices will participate in the initiated additional game, the 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 4 determination including conducting a random determination in respect of at least one eligible gaming device to determine whether the respective eligible gaming device will participate in the additional game. 5 In an embodiment, the additional game controller conducts random determinations in respect of all of the eligible gaming devices. 10 In an embodiment, the additional game controller determines that least one gaming device is to participate without being subject to the random determination. In an embodiment, a gaming device which caused the 15 additional game to initiate is determined to participate without being subject to the random determination. In an embodiment, at least one random determination is weighted to provide at least one gaming device with a 20 greater probability of being a participating gaming device relative to at least one other gaming device. In an embodiment, the additional game is initiated in response to occurrence of a trigger event. 25 In an embodiment, each of the gaming devices are arranged to determine whether the trigger event occurs on one of the eligible gaming devices. 30 In an embodiment, the gaming system is arranged to determine which of the gaming devices are eligible gaming devices based on which gaming device have been active in a designated period. 35 In an embodiment, the gaming system is arranged to determine which of the gaming devices are eligible gaming devices based on whether a designated wager has been made. 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 5 In an embodiment, each of a plurality of designated gaming devices are deemed to be an eligible gaming device. 5 In an embodiment, the additional game controller conducts separate additional games for each gaming device which is determined to participate. In an embodiment, the additional game controller conducts 10 a single additional game for all of the gaming devices which are determined to participate. In an embodiment, the probability of at least one outcome of the additional game is controlled by the additional 15 game controller such that at least one gaming device has a higher probability of winning the additional game than at least one other gaming device. In an embodiment, the probability is controlled in favour 20 of a gaming device which caused the additional game to initiate. In a third aspect, the invention provides an additional game controller adapted to communicate with a plurality of 25 gaming devices, the additional game controller configured to determine, in response to initiation of an additional game, which of the gaming devices will participate in the initiated additional game, the determination including conducting a random determination in respect of at least 30 one eligible gaming device to determine whether the respective eligible gaming device will participate in the additional game. In an embodiment, the additional game controller comprises 35 a random number generator and wherein the additional game controller comprises a participation module arranged to employ the random number generator to conduct each random 3919520_1 (GHMatters) P80217.AU.2 6/12/12 -6 determination. In an embodiment, the additional game controller is arranged to conduct random determinations in respect of 5 all of the eligible gaming devices. In an embodiment, the additional game controller determines that least one gaming device is to participate without being subject to the random determination. 10 In an embodiment, a gaming device which caused the additional game to initiate is determined to participate without being subject to the random determination. 15 In an embodiment, at least one random determination is weighted to provide at least one gaming device with a greater probability of being a participating gaming device relative to at least one other gaming device. 20 In an embodiment, the additional game controller is arranged to conduct separate additional games for each gaming device which is determined to participate. In an embodiment, the additional game controller is 25 arranged to conduct a single additional game for all of the gaming devices which are determined to participate. In an embodiment, the probability of at least one outcome of the additional game is controlled by the additional 30 game controller such that at least one gaming device has a higher probability of winning the additional game than at least one other gaming device. In an embodiment, the probability is controlled in favour 35 of a gaming device which caused the additional game to initiate. 3919520_1 (GHMatters) P80217.AU.2 6/12/12 In a fourth aspect, the invention provides a gaming system comprising: a plurality of gaming devices; and means for determining which of the plurality of 5 gaming devices will participate in the initiated additional game by conducting a random determination in respect of at least one eligible gaming device to determine whether the respective eligible gaming device will participate in the additional game. 10 In a fifth aspect, the invention provides a gaming system comprising: a plurality of electronic gaming machines each comprising a cabinet, a display mounted within the 15 cabinet, at least one input device mounted to the cabinet and a game controller disposed within the cabinet comprising a processor and a memory storing game control instructions which enable each game controller operating in response to operation of a respective at least one 20 input device by a player to conduct a respective game; and an additional game controller operably connected to the electronic gaming machines, the additional game controller comprising a processor and a memory storing additional game control instructions which when executed 25 causes the additional game controller to determine which of the plurality of electronic gaming machines will participate in the initiated additional game by conducting a random determination in respect of at least one eligible gaming device to determine whether the respective eligible 30 gaming device will participate in the additional game. In a sixth aspect, the invention provides computer program code which when executed implements the above method. 35 In a seventh aspect, the invention provides a tangible computer readable medium comprising the above program 3919520_1 (GHMatters) P80217.AU.2 6/12/12 -8 code. In an eighth aspect, the invention extends to transmitting the above program code. 5 Brief Description of Drawings An exemplary embodiment of the invention will now be 10 described with reference to the accompanying drawings in which: Figure 1 is a block diagram of a gaming system with an additional game controller; 15 Figure 2 is a perspective view of a stand alone gaming machine; Figure 3 is a block diagram of the functional components 20 of a gaming machine; Figure 4 is a schematic diagram of the functional components of a memory; 25 Figure 5 is a schematic diagram of a network gaming system; Figure 6 is a block diagram of an additional game controller; 30 Figure 7 is a functional block diagram of an additional game controller; Figure 8 is a flow chart of an embodiment; 35 Figure 9 is a functional block diagram of a gaming device in the form of a standalone gaming machine; 3919520_1 (GHMatters) P80217.AU.2 6/12/12 -9 Detailed Description Overview of exemplary gaming system 5 Figure 1 shows an exemplary gaming system 1 where an additional game controller 150 is in data communication over a network 2, such as an Ethernet, with a bank of five gaming devices in the form of standalone electronic gaming 10 machines 10. When an additional game is initiated, the additional game controller 150 is arranged to communicate with the gaming devices to determine how many are eligible and to then determine from the eligible gaming devices which gaming devices participate in the additional game. 15 That is, not all eligible gaming devices will necessarily participate in the additional game, although depending on the embodiment, some exceptions may be made for example, for a gaming device which caused the additional game to initiate or if there is only one eligible gaming device. 20 In the embodiment, the determination involves carrying out a random determination to determine which of the eligible gaming devices will participate. In one embodiment, the random determination is carried out in respect of all eligible gaming devices except the one which triggered the 25 additional game, this gaming device being guaranteed entry to the additional game. In some embodiments, there is an adjustment of the odds of at least one gaming device winning the additional game. For example, if there are N eligible gaming devices and an N/M) chance of the 30 additional game being won in any instance, chance can be apportioned amongst the participating gaming devices. For example, if there are 10 eligible gaming devices but only 5 participate each gaming device would have a 2/M chance of winning. Alternatively, the shares in the chance of 35 eligible machines which do not participate could be allocated to the gaming machine which triggered the game such that it has an increased chance of winning. For 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 10 example, for 5 participating gaming devices of 10 eligible devices, the triggering gaming device would have a chance of 6/M and the other gaming devices would have a chance of 1/M. Depending, on the embodiment, the outcome of the game 5 can be evaluated collectively (such that only one device may win) or independently such that each participating device may win. Gaming devices 10 Gaming devices capable of participating in the method of gaming of the embodiment can take any suitable form including stand alone gaming machines and server based gaming terminals. 15 A gaming device in the form of a stand alone gaming machine 10 is illustrated in Figure 2. The gaming machine 10 includes a console 12 having a display 14 on which are displayed representations of a game 16 that can be played 20 by a player. 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 mid-trim 20 also houses a credit input mechanism 24 which in this example includes a coin input 25 chute 24A and a bill collector 24B. Other credit input mechanisms may also be employed, for example, a card reader for reading a smart card, debit card or credit card. Other gaming machines may be configured for ticket in that they have a ticket reader for reading tickets 30 having a value and crediting the player 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 35 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 some embodiments, the player marketing 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 11 module may provide an additional credit mechanism, either by 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 5 the player marketing module. A top box 26 may carry artwork 28, including for example pay tables and details of bonus awards and other information or images relating to the game. Further 10 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. 15 The display 14 shown in Figure 2 is in the form of a video display unit, particularly a cathode ray tube screen device. Alternatively, the display 14 may be a liquid crystal display, plasma screen, any other suitable video display unit, or the visible portion of an 20 electromechanical device. The top box 26 may also include a display, for example a video display unit, which may be of the same type as the display 14, or of a different type. 25 Figure 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 Figure 2. The gaming machine 100 includes a game controller 101 30 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 35 volatile memory and more than one of each type of memory, with such memories being collectively represented by the memory 103. 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 12 The gaming machine has hardware meters 104 for purposes including ensuring regulatory compliance and monitoring player credit, an input/output (I/0) interface 105 for 5 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 10 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. 15 In the example shown in Figure 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 20 109, 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 25 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 uses to initiate a play of 30 the game. 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 35 information, accounting information or other information to a bonus controller, central controller, server or database and receive data or commands from the bonus 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 13 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 5 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 103. The memory 103 includes RAM 10 103A, EPROM 103B and a mass storage device 103C. The RAM 103A typically temporarily holds program files for execution by the processor 102 and related data. The EPROM 103B may be a boot ROM device and/or may contain some system or game related code. The mass storage device 15 103C 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 103B or elsewhere. 20 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. 25 In a client server architecture a gaming device is provided by a gaming client and game server (and optionally other gaming network components). A gaming client has a similar outward appearance to gaming machine 10 but the game server implements most or all of the game 30 and as such acts as the game controller while the terminal operated by the player essentially provides only the player interface. The gaming terminal receives player instructions, pass these to the game server which will process them and return game play outcomes to the gaming 35 machine for display. Further details of a server gaming architecture can be found in WO 2006/052213 and PCT/SE2006/000559, the disclosures of which are 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 14 incorporated herein by reference. In such an embodiment, an additional game controller can be provided, for example, by a dedicated server in data communication with the game server. 5 Figure 5 shows that a gaming device may be connected within a gaming network 200 which provides additional and/or enhanced functionality. The gaming network 200 includes a network 201, which for example may be an 10 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 machines 10,100 shown in Figures 2 and 3. While 15 banks 203 of two gaming machines are illustrated in Figure 5, banks of one, three or more gaming machines are also envisaged. One or more displays 204 may also be connected to the 20 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 25 promotional or informational material. In one example of an alternative embodiment, an additional game controller can be provided within such a network 200 by additional game server 205, such that the additional 30 game server may implement an additional game for a plurality of different banks of gaming machines rather than a specific controller being provide for each bank of gaming machines. 35 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 206A. 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 15 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 5 provided. Note also that in some embodiments, the additional game is a jackpot game and hence the additional game controller is a jackpot controller. Servers are also typically provided to assist in the 10 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 15 network 201 and the devices connected to the network. The gaming network 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, 20 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 25 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 30 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. 35 Figure 9 is a functional block diagram of a gaming device in the form of a stand alone gaming machine. The gaming 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 16 device 900 may be the same or different to gaming machine 10,100 described above. In Figure 9, the processor 930 of game controller 920 is shown implementing a number of modules based on program code and data stored in memory 5 940. Persons skilled in the art will appreciate that various of the modules could be implemented in some other way, for example by a dedicated circuit. The gaming device 900 includes a player interface 910 10 having a display 911 for displaying game outcomes to a player and a game play mechanism 912 including input devices such as touch screen or buttons to enable the player to interact with the game by placing wagers and entering any other instructions required to play the game. 15 Game play mechanism 912 also enables the player to interact with the game to learn game rules etc. The player interface 910 includes a credit mechanism 913 allowing the player to input credit into the gaming device 900 and/or be paid out any winnings or remaining credit. 20 A person skilled in the art will appreciate that other components will be present in a gaming device 900 such as those described in relation to Figures 2 to 4 above. The memory 940 includes program code for implementing a game including base game rule data 941 for implementing the 25 rules of a base game. The processor 930 when executing the program code stored in memory 940 is arranged to generate outcomes of the game in response to the operation of the game play mechanism 30 912. The outcomes are generated with the outcome generator 931. The outcome evaluator 932 evaluates the game outcomes that are generated based on the wager specified with the game play mechanism 912 and updates credit data 942 which stores a credit meter and a win 35 meter for the game. The processor 930 also implements a communication module 933 which is intended to communicate by communication interface 950 with an additional game 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 17 controller. As will be described in further detail below the communication module 933 is arranged to indicate to the additional game controller whether the gaming device 900 is eligible to participate in an additional game. 5 Accordingly, in one embodiment, the communication module includes a eligibility sub-module 933A which is intended to determine based on eligibility rule data 943 whether the gaming device 900 is eligible to participate in the 10 additional game. In one example, eligibility rule data 943 specifies a time period and eligibility sub-module 933A determines whether a game has been concluded within a defined time period prior to receipt of a polling request from the additional game controller. In another example, 15 the eligibility sub-module 933A also determines whether a relevant bet such as a maximum bet or an ante bet has been placed in the relevant time period. Alternatively, eligibility sub-module 933A communicates when the last game is completed. In this manner, the additional game 20 controller 150 can determine whether the gaming device 900 is currently being played and is eligible to participate in the additional game. Additional game controller and its operation within the 25 gaming system Referring to Figure 6 there is shown further detail of the additional game controller 150. From Figure 6 it will be apparent that additional game controller 150 is in data 30 communication with a communal display 160 on which game outcomes can be displayed to the players playing the bank of gaming machines 10 shown in Figure 1. In other embodiments, the game outcomes could be displayed on a top box of the individual gaming machines 10, rather than 35 being displayed on a communal display, or in addition to such a display. 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 18 Referring to Figure 6, the constitution of the additional game controller 150 is similar to that of the gaming device illustrated in relation to Figures 2 to 4 and Figure 9 in that it has a processor 151 arranged to 5 implement the additional game based on program code stored in memory 152 and a display driver 154 for driving the display 160 to show the additional game outcome. The additional game controller 150 also includes a communication interface 153 which is designed to enable 10 the processor 151 to communicate with each of the gaming devices 10. Persons skilled in the art will appreciate the above components are the core components for implementing a 15 additional game but other components may be present in an additional game controller. Persons skilled in the art will appreciate that the implementation of the additional game controller is analogous to the implementation of bonus controllers and jackpot controllers in existing 20 gaming systems and reference may be made to such controllers for further details of implementation. Figure 7 is a functional block diagram of the additional gaming controller 150 which shows that the processor 151 25 implements a number of modules in a similar manner to the processor of the gaming device shown in Figure 9. The processor executes program code stored in memory 152 to instantiate a eligibility module 703 which communicates via data communication interface 153 with each of the 30 gaming devices. In one example, this communication includes polling each of the gaming devices. In another example this may be by listening to output on the network from each of the individual gaming devices. In any event, the eligibility module 703 determines based on eligibility 35 rule data 712 the number of gaming machines which currently participating. That is, eligibility rule data 712 may specify how often the eligibility module should 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 19 poll individual gaming machines or the time period within which the gaming machines need to have last indicated that they are active in order to be eligible to participate in the additional game. 5 In the specific embodiment shown in Figure 8, the eligibility module 703 includes a trigger monitor 703A which is designed to monitor for receipt of a trigger signal from one of the gaming devices. Such a trigger 10 signal being output by communication interface 950 by trigger monitor 932A of outcome evaluator 932 of the respective gaming device. The trigger monitor 932A is arranged to determine based on the base game rule data 941 whether a trigger condition has been met. The trigger 15 condition can be one of any known trigger condition in the art such as a particular symbol combination being achieved in the underlying base game. When the trigger is received by the trigger monitor 703A, eligibility module 703 polls each of the gaming machines to determine whether they 20 comply with the eligibility requirements of the additional game, in this case, whether they have been active within a defined period. The eligibility sub-module 933A of each gaming device 900 outputs whether they are active at the time based on the eligibility rule data 943 as well as 25 data allowing the gaming machine to be identified. From these responses, eligibility module 703 determines the identity and number of gaming devices eligible for the additional game. From the eligible gaming devices, participation module 707 determines which gaming devices 30 will participate based on participation rules 714. In this embodiment, participation rules 714 specify that the gaming device which caused the game to initiate by the trigger event occurring in respect of a game played on it, gains automatic entry to the additional game. This is 35 advantageous as an additional game is always conducted. Thus, the participation module 707, determines which other eligible gaming devices will participate, thus assuming 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 20 there is at least one other eligible gaming device, participation module 707 employs random number generator 705 to conduct a random determination in respect of each other eligible gaming device to determine which of the 5 eligible gaming devices will participate. For example, each gaming device may have a 50:50 chance of participating. In this embodiment, the participation module 707 also comprises an odds assigner, which controls the relative and/or absolute odds of a particular gaming 10 device winning the additional game. In this embodiment, the outcome generator 701 is arranged to use random number generator 705 to first select a jackpot of three different jackpot levels stored as prize data, which is to be played for and this is display on communal display 160. The odds 15 of selection of the jackpots are stored as game rule data, and can be for example, such that the additional game is conducted, on average, for the major jackpot 1 in 20 times, the maxi jackpot 7 in 20 times, and the minor jackpot 12 in 20 times. 20 The outcome generator 701 then conducts a random determination using RNG 705 to determine whether one of the gaming devices will win the selected prize. In this example, if there are N eligible gaming devices, there is 25 a N/M chance of the additional game being won, where M is determined by the game designer to provide an appropriate return to player. The outcome generator 705 causes random number generator 707 to return a number in the range of 1 to M. If the value falls in the range 1 to N, one of the 30 participating gaming devices will win. In the embodiment, odds assigner 707A is arranged to assign the range 1 to N to individual participating gaming devices. This example, works in effect such that the shares in the chance of winning of eligible machines which do not participate are 35 allocated to the gaming machine which triggered the game such that it has an increased chance of winning. For example, for 5 participating gaming devices of 10 eligible 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 21 devices, the triggering gaming device would have a chance of 6/M and the other gaming devices would have a chance of 1/M such that the triggering gaming device is advantageously provided with better odds of winning. 5 In the above example, once a jackpot is selected the odds of each jackpot (major, maxi or minor) being awarded is the same. In other embodiments, the odds could be different, for example, there may be even chance of the 10 jackpots being selected but lower relative odds of the major jackpot being awarded than the maxi and minor jackpots. The jackpots may be fixed prizes or progressive prizes such as are known in the art. When a prize is awarded, the award is made under control of award module 15 706, for example by transferring credits to the relevant gaming device. In other embodiments, rather than a single determination being conducted by the outcome generator 701, separate 20 determinations may be conducted for each gaming device such that more than one gaming device may win an award. In a variation on the above embodiment, a random determination is conducted in respect of each eligible 25 gaming device to determine which will participate. In an example of such an embodiment, each participating gaming device has the same chance of winning the jackpot. In one example of such an embodiment, the odds are apportioned equally amongst the participating gaming devices. For 30 example, if there are 10 eligible gaming devices but only 5 participate each gaming device would have a 2/M chance of winning. Persons skilled in the art will appreciate that while the 35 above example describes the additional game being triggered, the additional game could instead be carried out periodically with each gaming device that played in a 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 22 previous time period being eligible. The method of embodiment is summarised in Figure 8 which shows that the method involves determining 810 a number of 5 participating gaming machines, conducting 820 random determinations in respect of at least one gaming device determining 830 the number of participating gaming devices, and conducting 840 the additional game with participating gaming machines. 10 In the above embodiment, the additional game controller is arranged to determine the additional game outcome. In other embodiments, the additional game controller could control participation but actual outcomes could be 15 calculated elsewhere such as by the gaming devices or another controller. Examples 20 Example 1 8 machines are linked and are connected to a common maxi prize of $5000 and a common minor prize of $500. (In this example the prize value is not progressive - i.e. 25 it is not changing as players bet on machines. The example works equally well if the prize is progressive or of a non-cash value) All machines are connected via an additional game 30 controller which monitors activity on the machines and can direct messages to the machines. All players are playing their machines. 35 Player on machine number 1 triggers the jackpot feature. (Triggering the jackpot feature can be in any of the known ways including but not limited to achieving an outcome on 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 23 the machine, causing a machine or system event) The additional game controller receives the message that the jackpot feature is triggered. 5 The additional game controller now randomly selects at least one of the machines on the link and determines that the machine will be eligible for the jackpot. 10 Where there are multiple jackpots available the additional game controller can determine which jackpot will be won. (This can be determined randomly or by reference to the manner in which the jackpot feature was triggered or by reference to the outcome of a feature game.) 15 The additional game controller sends a message to each selected machine to advise that the machine is eligible for the jackpot. If necessary, the machine will also be advised which jackpot will be won. 20 If the winning of the jackpot requires a feature game to be played, then the machine will now invoke the feature game. 25 If the additional game controller has determined which jackpot will be won, then the feature game will have an outcome to match the jackpot due to be won. If the machine determines which jackpot is to be won, then 30 the machine will play the feature game and the outcome of the feature game will determine which jackpot is won. Example 2 35 8 machines are linked and are connected to a common maxi prize of $5000 and a common minor prize of $500. (In this example the prize value is not progressive - i.e. 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 24 it is not changing as players bet on machines. The example works equally well if the prize is progressive or of a non-cash value.) 5 All machines are connected via an additional game controller which monitors activity on the machines and can direct messages to the machines. All players are playing their machines. 10 Player on machine number 1 triggers the jackpot feature. (triggering the jackpot feature can be in any of the known ways including but not limited to achieving an outcome on the machine, causing a machine or system event) 15 The additional game controller receives the message that the jackpot feature is triggered by machine 1. The additional game controller now randomly selects at 20 least one of the machines on the link including machine 1 and determines that the machine will be eligible for the jackpot. If the additional game controller has selected that 25 machine 1 and 1 other machine are eligible for the jackpot, the controller now determines that machine 1 will have a better chance of winning the maxi jackpot than the other machine. 30 The additional game controller will now advise the machines that a jackpot is eligible and the respective chance of winning the jackpots. Further aspects of the method will be apparent from the 35 above description of the gaming system. Persons skilled in the art will also appreciate that the method could be embodied in program code. The program code could be 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 25 supplied in a number of ways, for example on a tangible computer readable medium, such as a disc or a memory, or as a data signal (for example, by transmitting it from a server). 5 Persons skilled in the art will appreciate that in some embodiments, additional or alternative eligibility criteria may be applied, for example that the player has made a certain sized wager, made an ante bet, selected all 10 win lines, played sufficient games, or the player is a member of a loyalty program. In embodiments, which employ a trigger event, the trigger event may be, a symbol combination in the game, occurrence 15 of a specific symbol in the game, purchased, be caused by another connected system, based on turnover etc. It will be understood to persons skilled in the art of the invention that many modifications may be made without 20 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. 25 For example, the linked game controller 150 is shown in Figure 1 as a separate entity to the gaming devices 10. In an alternative embodiment, it could be provided by one of the gaming devices incorporating a server module arranged to implement the linked game controller in the manner 30 described in Australian patent application 2008205413 filed 13 August 2008. It is to be understood that, if any prior art is referred to herein, such reference does not constitute an admission 35 that the prior art forms a part of the common general knowledge in the art in any country. 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 26 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 5 "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. 3919520_1 (GHMatters) P80217.AU.2 6/12/12

Claims (44)

1. A method of gaming comprising: determining which of a plurality of gaming devices, 5 each operable for independent play of one or more games, are eligible for an additional game; initiating an additional game; and determining in response to initiation of the additional game, which eligible gaming devices will 10 participate in the initiated additional game, the determination including a random determination in respect of at least one of the eligible gaming devices to determine whether the respective eligible gaming device will participate in the additional game. 15

2. A method as claimed in claim 1, wherein the random determination is conducted in respect of all of the eligible gaming devices. 20

3. A method as claimed in claim 1, wherein at least one gaming device is determined to participate without being subject to the random determination.

4. A method as claimed in claim 3, wherein a gaming 25 device which caused the additional game to initiate is determined to participate without being subject to the random determination.

5. A method as claimed in any one of claims 1 to 4, 30 wherein at least one random determination is weighted to provide at least one gaming device with a greater probability of being a participating gaming device relative to at least one other gaming device. 35

6. A method as claimed in any one of claims 1 to 5, wherein the additional game is initiated in response to occurrence of a trigger event. 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 28

7. A method as claimed in claim 6, wherein the trigger event occurs on one of the eligible gaming devices.

8. A method as claimed in any one of claims 1 to 7, 5 comprising determining which of the gaming devices are eligible gaming devices based on which gaming device have been active in a designated period.

9. A method as claimed in any one of claims 1 to 8, 10 comprising determining which of the gaming devices are eligible gaming devices based on whether a designated wager has been made.

10. A method as claimed in any one of claims 1 to 7, 15 comprising determining which of the gaming devices are eligible gaming devices by deeming each of a plurality of designated gaming devices to be an eligible gaming device.

11. A method as claimed in any one of claims 1 to 10, 20 comprising conducting separate additional games for each gaming device which is determined to participate.

12. A method as claimed in any one of claims 1 to 10, comprising conducting a single additional game for all of 25 the gaming devices which are determined to participate.

13. A method as claimed in claim 11 or claim 12, wherein the probability of at least one outcome of the additional game is controlled such that at least one gaming device 30 has a higher probability of winning the additional game than at least one other gaming device.

14. A method as claimed in claim 13, wherein the probability is controlled in favour of a gaming device 35 which caused the additional game to initiate.

15. A gaming system comprising: 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 29 a plurality of gaming devices, each gaming device operable for independent play of one or more games; and an additional game controller in data communication with the gaming devices, the additional game controller 5 configured to determine, in response to initiation of the additional game, which of the plurality of gaming devices will participate in the initiated additional game, the determination including conducting a random determination in respect of at least one eligible gaming device to 10 determine whether the respective eligible gaming device will participate in the additional game.

16. A gaming system as claimed in claim 15, comprising a random number generator and wherein the additional game 15 controller comprises a participation module arranged to employ the random number generator to conduct each random determination.

17. A gaming system as claimed in claim 15 or claim 16, 20 the additional game controller conducts random determinations in respect of all of the eligible gaming devices.

18. A gaming system as claimed in claim 15 or claim 16, 25 wherein the additional game controller determines that least one gaming device is to participate without being subject to the random determination.

19. A gaming system as claimed in claim 18, wherein a 30 gaming device which caused the additional game to initiate is determined to participate without being subject to the random determination.

20. A gaming system as claimed in any one of claims 15 to 35 19, wherein at least one random determination is weighted to provide at least one gaming device with a greater probability of being a participating gaming device 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 30 relative to at least one other gaming device.

21. A gaming system as claimed in any one of claims 15 to 20, wherein the additional game is initiated in response 5 to occurrence of a trigger event.

22. A gaming system as claimed in claim 21, wherein each of the gaming devices are arranged to determine whether the trigger event occurs on one of the eligible gaming 10 devices.

23. A gaming system as claimed in any one of claims 15 to 22, arranged to determine which of the gaming devices are eligible gaming devices based on which gaming device have 15 been active in a designated period.

24. A gaming system as claimed in any one of claims 15 to 23, arranged to determine which of the gaming devices are eligible gaming devices based on whether a designated 20 wager has been made.

25. A gaming system as claimed in any one of claims 15 to 22, wherein each of a plurality of designated gaming devices are deemed to be an eligible gaming device. 25

26. A gaming system as claimed in any one of claims 15 to 25, wherein the additional game controller conducts separate additional games for each gaming device which is determined to participate. 30

27. A gaming system as claimed in any one of claims 15 to 26, wherein the additional game controller conducts a single additional game for all of the gaming devices which are determined to participate. 35

28. A gaming system as claimed in claim 26 or claim 27, wherein the probability of at least one outcome of the 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 31 additional game is controlled by the additional game controller such that at least one gaming device has a higher probability of winning the additional game than at least one other gaming device. 5

29. A gaming system as claimed in claim 28, wherein the probability is controlled in favour of a gaming device which caused the additional game to initiate. 10

30. An additional game controller for a gaming system, the additional game controller adapted to communicate with a plurality of gaming devices, the additional game controller configured to determine, in response to initiation of an additional game, which of the gaming 15 devices will participate in the initiated additional game, the determination including conducting a random determination in respect of at least one eligible gaming device to determine whether the respective eligible gaming device will participate in the additional game. 20

31. An additional game controller as claimed in claim 30, comprising a random number generator and wherein the additional game controller comprises a participation module arranged to employ the random number generator to 25 conduct each random determination.

32. An additional game controller as claimed in claim 30 or claim 31, arranged to conduct random determinations in respect of all of the eligible gaming devices. 30

33. An additional game controller as claimed in claim 30 or claim 31, wherein the additional game controller determines that least one gaming device is to participate without being subject to the random determination. 35

34. An additional game controller as claimed in claim 33, wherein a gaming device which caused the additional game 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 32 to initiate is determined to participate without being subject to the random determination.

35. An additional game controller as claimed in any one 5 of claims 30 to 34, wherein at least one random determination is weighted to provide at least one gaming device with a greater probability of being a participating gaming device relative to at least one other gaming device. 10

36. An additional game controller as claimed in any one of claims 30 to 35, arranged to conduct separate additional games for each gaming device which is determined to participate. 15

37. An additional game controller as claimed in any one of claims 30 to 36, arranged to conduct a single additional game for all of the gaming devices which are determined to participate. 20

38. An additional game controller as claimed in claim 36 or claim 37, wherein the probability of at least one outcome of the additional game is controlled by the additional game controller such that at least one gaming 25 device has a higher probability of winning the additional game than at least one other gaming device.

39. An additional game controller as claimed in claim 38, wherein the probability is controlled in favour of a 30 gaming device which caused the additional game to initiate.

40. A gaming system comprising: a plurality of gaming devices; and 35 means for determining which of the plurality of gaming devices will participate in the initiated additional game by conducting a random determination in 3919520_1 (GHMatters) P80217.AU.2 6/12/12 - 33 respect of at least one eligible gaming device to determine whether the respective eligible gaming device will participate in the additional game. 5

41. A gaming system comprising: a plurality of electronic gaming machines each comprising a cabinet, a display mounted within the cabinet, at least one input device mounted to the cabinet and a game controller disposed within the cabinet 10 comprising a processor and a memory storing game control instructions which enable each game controller operating in response to operation of a respective at least one input device by a player to conduct a respective game; and an additional game controller operably connected to 15 the electronic gaming machines, the additional game controller comprising a processor and a memory storing additional game control instructions which when executed causes the additional game controller to determine which of the plurality of electronic gaming machines will 20 participate in the initiated additional game by conducting a random determination in respect of at least one eligible gaming device to determine whether the respective eligible gaming device will participate in the additional game. 25

42. Computer program code which when executed implements the method of any one of claims 1 to 14.

43. A tangible computer readable medium comprising the computer program code of claim 42. 30

44. Transmitting computer program code which when executed implements the method of any one of claims 1 to 14. 35 3919520_1 (GHMatters) P80217.AU.2 6/12/12