AU2012213959B2

AU2012213959B2 - A gaming system, jackpot controller, and a jackpot triggering method

Info

Publication number: AU2012213959B2
Application number: AU2012213959A
Authority: AU
Inventors: Sen Van Ly
Original assignee: Aristocrat Technologies Australia Pty Ltd
Current assignee: Aristocrat Technologies Australia Pty Ltd
Priority date: 2007-12-05
Filing date: 2012-08-15
Publication date: 2015-04-16
Anticipated expiration: 2028-12-02
Also published as: AU2012213959A1

Abstract

Abstract A jackpot triggering method comprising: determining a jackpot trigger value from a current value of at least one 5 jackpot trigger parameter; generating a submission value in response to receipt of a contribution associated with a gaming device participating in the jackpot, by using a value of at least one contribution parameter associated with the contribution as a seed value to randomly generate 10 the submission value; and making a jackpot award if the submission value corresponds to the jackpot trigger value. 3602975_1 (GHMatters) P74122.AU.2 15/08/12 receive contribution obtain value of contribution parameter calculate submission value compare with Jackpot trigger value award jackpot? make award reset jackpot Figure 6

Description

AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION Standard Patent Applicant: Aristocrat Technologies Australia Pty Limited Invention Title: A GAMING SYSTEM, JACKPOT CONTROLLER, AND A JACKPOT TRIGGERING METHOD The following statement is a full description of this invention, including the best method for performing it known to me/us: - 1 A GAMING SYSTEM, JACKPOT CONTROLLER, AND A JACKPOT TRIGGERING METHOD Related Application 5 This application is a divisional application of Australian application no. 2008252035, the disclosure of which is incorporated herein by reference. Most of the disclosure of that application is also included herein, however, 10 reference may be made to the specification of application no. 2008252035 as accepted to gain further understanding of the invention claimed herein. Field 15 The present invention relates to a gaming system, a jackpot controller, and a jackpot triggering method. Background 20 Many venues employ jackpot controllers for awarding jackpots to one of or more of a plurality of gaming machines participating in the jackpot. Typically, a portion of turnover on each gaming machine is forwarded to 25 a jackpot controller as a contribution. That is, part of each wager goes towards the jackpot. The technique can be extended to a so called wide area jackpot where gaming machines from a number of different venues contribute to a single jackpot pool. 30 One common way of awarding a jackpot is a so called mystery jackpot where a trigger value, generally in a prize range, is randomly selected and stored by the jackpot controller. The jackpot controller determines to 35 award the jackpot prized when the contributions cause the value of the jackpot pool to reach the trigger value. 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 2 A problem with this sort of jackpot is that while such jackpots are generally randomly determined, the range of jackpot prizes can become known and can affect play. For example, play of gaming machines may drop off just after a 5 jackpot is awarded because players perceive the chance of winning a jackpot is diminished shortly after a previous jackpot is awarded. Similarly, play may increase as a progress jackpot reaches a value near a known upper limit. 10 There is a need for an alternative technique for determining to award a jackpot to a player. Summary of the Invention 15 In a first aspect there is provided a jackpot triggering method in a gaming system comprising a plurality of gaming devices, the jackpot method comprising: determining a jackpot trigger value from a current value of at least one jackpot trigger parameter; 20 processing a contribution associated with a gaming device participating in the jackpot to determine an amount associated with the contribution, and to determine a value of at least one contribution parameter associated with the contribution; 25 generating a number of submission values in response to receipt of the contribution, each submission value being generated by using the value of the at least one contribution parameter as a seed value to randomly generate the submission value, wherein the number of 30 submission values generated is in proportion with the amount associated with the contribution; and making a jackpot award if one of the submission values corresponds to the jackpot trigger value. 35 In an embodiment, there are a defined set of values of the jackpot trigger parameter and determining the jackpot value comprises mapping the current value to one of the 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 3 defined set of values, and the submission values may only take values corresponding to the defined set of values. In an embodiment, the number of values in the set of 5 values corresponds to a desired hit rate of the jackpot. In an embodiment, the at least one jackpot trigger parameter is selected from the group including: current time; 10 current pool value; and number of contributions made. In an embodiment, the at least one contribution parameter is selected from the group including: 15 arrival time of the contribution; number of games played on a gaming device associated with the contribution; turnover on a gaming device associated with the contribution; and 20 total win on a gaming device associated with the contribution. In an embodiment, the jackpot trigger value is determined from at least two parameters. 25 In an embodiment, the jackpot trigger parameter is at least one parameter associated with a jackpot controller. In an embodiment, the submission value is determined from 30 at least two parameters associated with the contribution. In a second aspect there is provided a jackpot controller arranged to: determine a jackpot trigger value from a current 35 value of at least jackpot trigger parameter; process a contribution associated with a gaming device participating in the jackpot to determine an amount 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 4 associated with the contribution, and to determine a value of at least one contribution parameter associated with the contribution; generate a number of submission values in response to 5 receipt of the contribution, each submission value being generated by using the value of the at least one contribution parameter as a seed value to randomly generate the submission value, wherein the number of submission values generated is in proportion with the 10 amount associated with the contribution; and make a jackpot award if one of the submission values corresponds to the jackpot trigger value. In an embodiment, the jackpot controller comprises a 15 random number generator arranged to receive the value of the contribution parameter and generate the submission value. In an embodiment, the jackpot controller comprises a 20 contribution processor arranged to process the contribution to determine the value of the at least one contribution parameter. In an embodiment, there are a defined set of values of the 25 jackpot trigger parameter and the jackpot controller is arranged to determine the jackpot trigger value by mapping the current value to one of the defined set of values, and wherein the submission values may only take values corresponding to the defined set of values. 30 In an embodiment, the number of values in the set of values corresponds to a desired hit rate of the jackpot. In an embodiment, the at least one jackpot trigger 35 parameter is selected from the group including: current time; current pool value; and 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 5 number of contributions made. In an embodiment, the at least one contribution parameter is selected from the group including: 5 arrival time of the contribution; number of games played on a gaming device associated with the contribution; turnover on a gaming device associated with the contribution; and 10 total win on a gaming device associated with the contribution. In an embodiment, the jackpot controller is arranged to determine the jackpot trigger value from at least two 15 parameters. In an embodiment, the jackpot trigger parameter is at least one parameter associated with a jackpot controller. 20 In an embodiment, the submission value is determined from at least two parameters associated with the contribution. In an embodiment, the jackpot controller is implemented, at least in part, by a processor arranged to process 25 contributions to determine whether to make a jackpot award. In a third aspect there is provided a gaming system comprising 30 a plurality of gaming devices which may participate in a jackpot by making jackpot contributions; and a jackpot controller arranged to: determine a jackpot trigger value from a current value of at least jackpot trigger parameter 35 process a contribution associated with a respective gaming device participating in the jackpot to determine an amount associated with the contribution, and 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 6 to determine a value of at least one contribution parameter associated with the contribution; generate a number of submission values in response to receipt of the contribution from the 5 respective gaming device participating in the jackpot, each submission value being generated by using the value of the at least one contribution parameter as a seed value to randomly generate the submission value, wherein the number of submission values generated is in proportion 10 with the amount associated with the contribution; and make a jackpot award if one of the submission value corresponds to the jackpot trigger value. In an embodiment, the jackpot controller comprises a 15 random number generator arranged to receive the value of the contribution parameter and generate the submission value. In an embodiment, the jackpot controller comprises a 20 contribution processor arranged to process the contribution to determine the value of the at least one contribution parameter. In an embodiment, there are a defined set of values of the 25 jackpot trigger parameter and the jackpot controller is arranged to determine the jackpot value by mapping the current value to one of the defined set of values, and wherein the submission values may only take values corresponding to the defined set of values. 30 In an embodiment, the number of values in the set of values corresponds to a desired hit rate of the jackpot. In an embodiment, the at least one jackpot trigger 35 parameter is selected from the group including: current time; current pool value; and 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 7 number of contributions made. In an embodiment, the at least one contribution parameter is selected from the group including: 5 arrival time of the contribution; number of games played on a gaming device associated with the contribution; turnover on a gaming device associated with the contribution; and 10 total win on a gaming device associated with the contribution. In an embodiment, the jackpot controller is arranged to determine the jackpot trigger value from at least two 15 parameters. In an embodiment, the jackpot trigger parameter is at least one parameter associated with a jackpot controller. 20 In an embodiment, the submission value is determined from at least two parameters associated with the contribution. In a fourth aspect, the invention provides computer program code which when executed implements the above 25 method. In a fifth aspect, the invention provides a computer readable medium comprising the program code. 30 In a sixth aspect, the invention provides a data signal comprising the program code. In a seventh aspect, the invention extends to transmitting the program code. 35 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 8 Brief Description of Drawings An exemplary embodiment of the invention will be described in relation to the accompanying drawings in which: 5 Figure 1 is a block diagram of a gaming system; Figure 2 is a perspective view of a gaming device in the form of a stand alone gaming machine; 10 Figure 3 is a block diagram of the functional components of a gaming machine; Figure 4 is a schematic diagram of the functional 15 components of a memory; Figure 5 is a block diagram of a jackpot controller; and Figure 6 is a flow chart of an embodiment. 20 Detailed Description Referring to the drawings, there is shown a gaming system arranged to implement a jackpot controller adapted to make 25 a non-deterministic jackpot award to any one or more of a plurality of gaming devices to which it is connected which are participating in the jackpot. General System Configuration 30 In the gaming system configuration 100, a jackpot controller 110 is in data communication with a plurality of gaming devices 120 over a network 130. A person skilled in the art will also appreciate that other 35 configurations may be viable. Gaming Devices 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 9 Herein, the term gaming device is used to refer to any device used by a player to a play a game and specifically includes stand alone gaming machines and interactive video 5 terminals which implement games in a client/server architecture. A gaming device in the form of a stand alone gaming machine 10 is illustrated in Figure 2. The gaming machine 10 10 includes a console 12 having a display 14 on which is displayed representations of a game 16 that can be played 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 15 game play. The mid-trim 20 also houses a credit input mechanism 24 which in this example includes a coin input 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 20 card. A player marketing module comprising 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 drive or any other portable storage medium 25 capable of being read by the reading device. 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 30 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. 35 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 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 10 crystal display, plasma screen, any other suitable video display unit, or the visible portion of an electromechanical device. The top box 26 may also include a display, for example a video display unit, which may be 5 of the same type as the display 14, or of a different type. Figure 3 shows a block diagram of operative components of a typical gaming machine 300 which may be the same as or 10 different to the gaming machine of Figure 2. The gaming machine 300 includes a game controller 301 having a processor 302. Instructions and data to control operation of the processor 302 are stored in a memory 303, 15 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, with such memories being collectively represented by the memory 303. 20 The gaming machine has hardware meters 304 for purposes including ensuring regulatory compliance and monitoring player credit, an input/output (I/O) interface 305 for communicating with peripheral devices of the gaming 25 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 for use with the input/output interface or the peripheral devices. A random number generator module 313 generates 30 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. In the example shown in Figure 3, a player interface 320 35 includes peripheral devices that communicate with the game controller 301 comprise one or more displays 306, buttons and/or a touch screen 307, a card and/or ticket reader 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 11 308, 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 5 specific implementation. 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 10 information, accounting information or other information to a central controller, server or database and receive data or commands from the central controller, server or database. 15 Figure 4 shows a block diagram of the main components of an exemplary memory 303. The memory 303 includes RAM 303A, EPROM 303B and a mass storage device 303C. The RAM 303A typically temporarily holds program files for execution by the processor 302 and related data. The 20 EPROM 303B may be a boot ROM device and/or may contain some system or game related code. The mass storage device 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 25 or elsewhere. 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 30 provided remotely from the game controller 301. A gaming device as indicated above may also take the form of a client/server architecture where a portion of the game is executed on the client and a portion of the game 35 is executed on the server. In such embodiments, the client typically takes the form of an interactive video terminal which has a similar outward appearance to the 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 12 gaming machine described above. A person skilled in the art will appreciate that the type of gaming device that is employed is not important to the present invention. 5 The Jackpot Controller As individual games are played on gaming devices in the form the gaming machines 120 of Figure 1, data indicating the contributions of individual games is sent over the 10 network to the jackpot controller 110 (shown in more detail in Figure 5). In this respect, the jackpot controller operates in the same manner as a conventional jackpot controller. Accordingly it will be appreciate that the individual gaming machines may contribute towards 15 several jackpot pools or contribute towards different jackpot pools. A contribution processor module 510 processes each contribution received from the gaming devices 120 and 20 updates the jackpot pool data 520 with an amount corresponding to the contribution. The contribution processor 510 also determines the value of a contribution parameter associated with the contribution. The contribution parameter can take a number of forms and can 25 be, for example, the arrival time of the contribution, the number of games played on a gaming device associated with the contribution, turnover on a gaming device associated with the contribution, total win on a gaming device associated with the contribution or any other item 30 derivable either from the data communicated from the gaming device or derivable from its arrival at the jackpot controller 110 as well as combinations thereof. The value is used as a seed value to randomly generate a submission value for use in determining whether to make a jackpot 35 award as described in further detail below. The value to be used as the seed value is communicated to 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 13 the award determiner 530. The submission value generator of the award determiner 531 provides the seed value to a random number generator 540, obtains a submission value, and returns the submission value to the submission value 5 generator 531. The submission value generator 531 provides the submission value to comparator 530. Concurrently, a trigger value determiner 533, determines a current value of a jackpot trigger value from the current value of at least one jackpot trigger parameter. The 10 jackpot trigger value parameter is typically a system value associated with a jackpot controller. For example, the current time, the current pool value or the current number of contributions made. 15 This current value is mapped to a value of a defined set of possible values that the jackpot trigger value is able to take as will be described in further detail below. The submission value generator 531 is also arranged so that the submission value may only take values corresponding to 20 the defined set of values. The trigger value determiner 533 supplies the current value to the comparator 532 which determines whether the values correspond. For example, by determining whether the values match exactly or by determining whether they are within a defined tolerance 25 with one another. If the values correspond, the award determiner 530 determines that an award should be made to the player of the gaming device that made the contribution and makes the award. For example, by sending a jackpot win signal to the gaming device 120. In the embodiment, 30 the number of values in the set of defined values typically corresponds to a desired hit rate of the jackpot. It will be appreciated that in the embodiment, the jackpot 35 controller 110 is described as having a number of different modules 510,530,540. The jackpot controller can effectively be a specially configure server computer (as 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 14 is known in the art). Accordingly, modules 510,530,540 can be implemented by a processor of the server executing program code routines stored in a memory, the memory also arranged to store data 520,550. 5 The method 600 is summarised in Figure 6 and involves receiving 610 a contribution, obtaining 620 the value of the contribution corresponding to the contribution, and calculating 630 a submission value. The submission value 10 is compared 640 to the current value of the jackpot trigger parameter. From the comparison, it is determined 650 whether to award a jackpot. If no jackpot is awarded the next contribution is processed. If a jackpot is to be awarded, the award is made 660 and the jackpot reset 670 15 before the next contribution is processed. Further aspects of the method will be apparent from the above description. Persons skilled in the art will also appreciate that the method could be embodied in program 20 code. The program code could be supplied in a number of ways, for example on a computer readable medium, such as a disc or a memory (for example, that could replace part of memory 103) or as a data signal (for example, by downloading it from a server to the jackpot controller). 25 Persons skilled in the art will appreciate that in some embodiments, the chance of winning the jackpot should be proportional to the contribution. In such embodiments, more than one submission value may be generated in respect 30 of each contribution (based on its value), for example, by using the same seed value to obtain two different random submission values from the random number generator 540 if the contribution is twice a base contribution amount. 35 Example In one example, the contribution processor 510 determines 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 15 the time at which the contribution is received to be the contribution parameter and this is supplied to the award determiner. The jackpot trigger parameter of the system which is used is the current system time of the jackpot 5 controller 500. The triggering time value is a fractional value, such as the hours of a day, day of the month, day of the year, seconds of the day/hour etc. The fraction corresponds to 10 the desired hit rate. The random number generator 540 is arranged to return values within the corresponding number of fractions. For example, if the desired hit rate is 1 in 100,000 the day can be divided up into sections of 100,000 and the trigger value determiner 533 maps the 15 current time to one of the numbers in the range of 1 to 100,000. Similarly, the submission time of the contribution is used by the submission value generator 531 to generate another value in the range of 1 to 100,000 from which it is determined by the comparator 532 whether 20 there is a match. 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 25 implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention. 30 It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any 35 other country. 6310351_1 (GHMatters) P74122.AU.2 DEBORAM

Claims

1. A jackpot triggering method in a gaming system comprising a plurality of gaming devices, the jackpot 5 method comprising: determining a jackpot trigger value from a current value of at least one jackpot trigger parameter; processing a contribution associated with a gaming device participating in the jackpot to determine an amount 10 associated with the contribution, and to determine a value of at least one contribution parameter associated with the contribution; generating a number of submission values in response to receipt of the contribution, each submission value 15 being generated by using the value of the at least one contribution parameter as a seed value to randomly generate the submission value, wherein the number of submission values generated is in proportion with the amount associated with the contribution; and 20 making a jackpot award if one of the submission values corresponds to the jackpot trigger value.

2. A method as claimed in claim 1, wherein there are a defined set of values of the jackpot trigger parameter and 25 determining the jackpot value comprises mapping the current value to one of the defined set of values, and the submission values may only take values corresponding to the defined set of values. 30

3. A method as claimed in claim 2, wherein the number of values in the set of values corresponds to a desired hit rate of the jackpot.

4. A method as claimed in any one of claims 1 to 3, 35 wherein the at least one jackpot trigger parameter is selected from the group including: current time; 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 17 current pool value; and number of contributions made.

5. A method as claimed in any one of claims 1 to 4, 5 wherein the at least one contribution parameter is selected from the group including: arrival time of the contribution; number of games played on a gaming device associated with the contribution; 10 turnover on a gaming device associated with the contribution; and total win on a gaming device associated with the contribution. 15

6. A method as claimed in any one of claims 1 to 5, wherein the jackpot trigger value is determined from at least two parameters.

7. A method as claimed in any one of claims 1 to 6, 20 wherein the jackpot trigger parameter is at least one parameter associated with a jackpot controller.

8. A method as claimed in any one of claims 1 to 7, wherein the submission value is determined from at least 25 two parameters associated with the contribution.

9. A jackpot controller arranged to: determine a jackpot trigger value from a current value of at least jackpot trigger parameter; 30 process a contribution associated with a gaming device participating in the jackpot to determine an amount associated with the contribution, and to determine a value of at least one contribution parameter associated with the contribution; 35 generate a number of submission values in response to receipt of the contribution, each submission value being generated by using the value of the at least one 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 18 contribution parameter as a seed value to randomly generate the submission value, wherein the number of submission values generated is in proportion with the amount associated with the contribution; and 5 make a jackpot award if one of the submission values corresponds to the jackpot trigger value.

10. A jackpot controller as claimed in claim 9, comprising a random number generator arranged to receive 10 the value of the contribution parameter and generate the submission value.

11. A jackpot controller as claimed in claim 9 or claim 10, comprising a contribution processor arranged to 15 process the contribution to determine the value of the at least one contribution parameter.

12. A jackpot controller as claimed in claim any one of claims 9 to 11, wherein there are a defined set of values 20 of the jackpot trigger parameter and the jackpot controller is arranged to determine the jackpot trigger value by mapping the current value to one of the defined set of values, and wherein the submission values may only take values corresponding to the defined set of values. 25

13. A jackpot controller as claimed in claim 12, wherein the number of values in the set of values corresponds to a desired hit rate of the jackpot. 30

14. A jackpot controller as claimed in any one of claims 9 to 13, wherein the at least one jackpot trigger parameter is selected from the group including: current time; current pool value; and 35 number of contributions made.

15. A jackpot controller as claimed in any one of claims 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 19 9 to 14, wherein the at least one contribution parameter is selected from the group including: arrival time of the contribution; number of games played on a gaming device associated 5 with the contribution; turnover on a gaming device associated with the contribution; and total win on a gaming device associated with the contribution. 10

16. A jackpot controller as claimed in any one of claims 9 to 15, wherein the jackpot controller is arranged to determine the jackpot trigger value from at least two parameters. 15

17. A jackpot controller as claimed in any one of claims 9 to 16, wherein the jackpot trigger parameter is at least one parameter associated with a jackpot controller. 20

18. A jackpot controller as claimed in any one of claims 9 to 17, wherein the submission value is determined from at least two parameters associated with the contribution.

19. A jackpot controller as claimed in any one of claims 25 9 to 18 implemented, at least in part, by a processor arranged to process contributions to determine whether to make a jackpot award.

20. A gaming system comprising 30 a plurality of gaming devices which may participate in a jackpot by making jackpot contributions; and a jackpot controller arranged to: determine a jackpot trigger value from a current value of at least jackpot trigger parameter 35 process a contribution associated with a respective gaming device participating in the jackpot to determine an amount associated with the contribution, and 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 20 to determine a value of at least one contribution parameter associated with the contribution; generate a number of submission values in response to receipt of the contribution from the 5 respective gaming device participating in the jackpot, each submission value being generated by using the value of the at least one contribution parameter as a seed value to randomly generate the submission value, wherein the number of submission values generated is in proportion 10 with the amount associated with the contribution; and make a jackpot award if one of the submission value corresponds to the jackpot trigger value.

21. A gaming system as claimed in claim 20, wherein the 15 jackpot controller comprises a random number generator arranged to receive the value of the contribution parameter and generate the submission value.

22. A gaming system as claimed in claim 20 or claim 21, 20 wherein the jackpot controller comprises a contribution processor arranged to process the contribution to determine the value of the at least one contribution parameter. 25

23. A gaming system as claimed in claim any one of claims 20 to 22, wherein there are a defined set of values of the jackpot trigger parameter and the jackpot controller is arranged to determine the jackpot value by mapping the current value to one of the defined set of values, and 30 wherein the submission values may only take values corresponding to the defined set of values.

24. A gaming system as claimed in claim 23, wherein the number of values in the set of values corresponds to a 35 desired hit rate of the jackpot.

25. A gaming system as claimed in any one of claims 20 to 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 21 24, wherein the at least one jackpot trigger parameter is selected from the group including: current time; current pool value; and 5 number of contributions made.

26. A gaming system as claimed in any one of claims 20 to 25, wherein the at least one contribution parameter is selected from the group including: 10 arrival time of the contribution; number of games played on a gaming device associated with the contribution; turnover on a gaming device associated with the contribution; and 15 total win on a gaming device associated with the contribution.

27. A gaming system as claimed in any one of claims 20 to 26, wherein the jackpot controller is arranged to 20 determine the jackpot trigger value from at least two parameters.

28. A gaming system as claimed in any one of claims 20 to 27, wherein the jackpot trigger parameter is at least one 25 parameter associated with a jackpot controller.

29. A gaming system as claimed in any one of claims 20 to 28, wherein the submission value is determined from at least two parameters associated with the contribution. 30

30. Computer program code which when executed implements the method of any one of claims 1 to 9.

31. A computer readable medium comprising the program 35 code of claim 30. 6310351_1 (GHMatters) P74122.AU.2 DEBORAM - 22

32. A data signal comprising the program code of claim 30. 5 6310351_1 (GHMatters) P74122.AU.2 DEBORAM