AU2016269454A1

AU2016269454A1 - A gaming system

Info

Publication number: AU2016269454A1
Application number: AU2016269454A
Authority: AU
Inventors: Michael Ian Jones; Lynne Cheryl Oldfield
Original assignee: Aristocrat Technologies Australia Pty Ltd
Current assignee: Aristocrat Technologies Australia Pty Ltd
Priority date: 2007-06-28
Filing date: 2016-12-06
Publication date: 2016-12-22
Also published as: AU2015200061A1; AU2023202942A1; AU2021202443A1; AU2011221400A1; AU2018274960A1; AU2018274960B2

Abstract

Abstract 5 A ticket management system (10) for a gaming system is disclosed. The ticket management system comprises at least one gaming machine (12) and is arranged to allocate tickets (22) to at least one gaming machine (12) in accordance with at least one allocation criterion (36). 10 An award is provided to a player of a gaming machine (12) when a ticket allocated to the gaming machine corresponds to a winning outcome. 8489370_1 (GHMatters) P75811.AU.5

Description

2016269454 06 Dec 2016 1

A GAMING SYSTEM

Field of the Invention 5 The present invention relates to a gaming system, to a ticket management system for a gaming system, and to a method of gaming.

Background of the Invention 10

It is known to provide a gaming system which includes a plurality of gaming machines arranged such that each gaming machine contributes a proportion of game turnover to a progressive jackpot. In one variation, a prize is 15 awarded to a player of a gaming machine when the gaming machine displays a particular game outcome. In an alternative variation, a prize is awarded when the jackpot amount reaches a threshold amount, with the player of the gaming machine causing the threshold to be exceeded being 20 awarded a prize.

However, while gaming systems including such progressive jackpots provide users with enjoyment, a need exists for alternative gaming systems in order to maintain or 25 increase player enjoyment.

Summary of the Invention

In accordance with a first aspect of the present 30 invention, there is provided a gaming system comprising: a plurality of gaming machines; and a ticket management system arranged to allocate tickets to at least some of the gaming machines in accordance with at least one allocation criterion; 35 wherein an award is provided to a player of a gaming machine when a ticket allocated to the gaming machine corresponds to a winning outcome; and 8489370J (GHMaUers) P75811 AU.5 2016269454 06 Dec 2016 2 wherein the ticket management system is arranged to draw at least one ticket when a predetermined number of tickets less than the total number of available tickets have been allocated, the drawn ticket corresponding to a 5 winning outcome.

The award may be a monetary prize, at least one feature award, or at least one free game. 10 The ticket may be printed by the gaming machine, for example in the form of a scratch card, or may be a virtual ticket.

In an embodiment wherein the ticket is printed, at least 15 one ticket may include information indicative of whether the ticket corresponds to a winning outcome, and may include information indicative of an award such that allocation of the ticket to a gaming machine provides an award to a player of the gaming machine. 20

In one embodiment, the ticket management system is arranged to allocate a ticket to a gaming machine when the turnover of the gaming machine reaches a turnover milestone, or each time the turnover of the gaming machine 25 reaches one of a plurality of turnover milestones.

In an alternative embodiment, the ticket management system is arranged to allocate a ticket to a gaming machine when a specific number of games have been played by the gaming 30 machine.

In an alternative embodiment, the ticket management system is arranged to allocate a ticket to a gaming machine when a specific game outcome occurs, for example based on one 35 or more winning outcomes at the gaming machine. 8489370_1 (GHMatters) P75811 AU.5 2016269454 06 Dec 2016 3

In one embodiment, the ticket management system is arranged to allocate a ticket to a gaming machine when a special bet is placed. 5 In one embodiment, the ticket management system is arranged to allocate a ticket to a gaming machine when a specific period of time has elapsed since allocation of a ticket or since at least one ticket was drawn. 10 In one arrangement, the gaming system comprises a prize pool and the ticket management system is arranged so as to increase the prize pool as the number of allocated tickets increases. Each gaming machine may contribute a credit amount to the prize pool when a ticket is allocated to the 15 gaming machine.

In one embodiment, the gaming system comprises a plurality of gaming machines and the ticket management system is arranged to: 20 allocate tickets to at least some of the gaming machines in accordance with at least one allocation criterion; and draw at least one ticket when at least one draw criterion is satisfied, the or each drawn ticket 25 corresponding to a winning outcome.

The ticket management system may be arranged to draw at least one ticket when the prize pool reaches a specific amount, or when the prize pool reaches a pseudo randomly 30 selected amount.

In an alternative embodiment, the ticket management system is arranged to draw at least one ticket when a specific period of time has elapsed since a ticket was drawn. 35

In an alternative arrangement, the gaming system may be arranged such that for n successive ticket draws the 8489370.1 (GHMatters) P75811 AU.5 2016269454 06 Dec 2016 4 ticket management system is arranged to draw at least one ticket when a specific number of tickets less than the total number of available tickets have been allocated, and for an (n+l)th ticket draw the ticket management system is 5 arranged to draw at least one ticket when all available tickets have been allocated.

The ticket management system may be arranged to control and coordinate operations in the ticket management system, 10 and may comprise a ticket memory arranged to store tickets .

The ticket control unit may comprise a processor and a control unit memory arranged to store programs, allocation 15 criteria and draw criteria usable by the control unit.

In accordance with a second aspect of the present invention, there is provided a ticket management system arranged to allocate tickets to at least some gaming 20 machines in accordance with at least one allocation criterion; wherein an award is provided to a player of a gaming machine when a ticket allocated to the gaming machine corresponds to a winning outcome; and 25 wherein the ticket management system is arranged to draw at least one ticket when a predetermined number of tickets less than the total number of available tickets have been allocated, the drawn ticket corresponding to a winning outcome. 30

In accordance with a third aspect of the present invention, there is provided a method of gaming comprising : providing a plurality of gaming machines; 35 allocating at least one ticket to at least some of the gaming machines in accordance with at least one allocation criterion; 8489370_1 (GHMaUers) P75811 AU.5 2016269454 06 Dec 2016 5 awarding a prize to a player of a gaming machine when a ticket allocated to the gaming machine corresponds to a winning outcome; and drawing at least one ticket when a predetermined 5 number of tickets less than the total number of available tickets have been allocated, the drawn ticket corresponding to a winning outcome.

Brief Description of the Drawings 10

The present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

Figure 1 is a diagrammatic block diagram of a gaming 15 system in accordance with an embodiment of the present invention;

Figure 2 is a schematic block diagram of components of a ticket control unit of the gaming system shown in Figure 1; 20 Figure 3 is a diagrammatic representation of an example gaming machine of the gaming system shown in Figure 1;

Figure 4 is a schematic block diagram of operative components of the gaming machine shown in Figure 3; 25 Figure 5 is a schematic diagram of components of a memory of the gaming machine shown in Figure 3; and

Figure 6 is a flow diagram illustrating a method of gaming in accordance with an embodiment of the present invention . 30

Description of an Embodiment of the Invention

Referring to the drawings, there is shown a gaming system 10 which comprises a plurality of gaming machines 12 35 connected through a gaming network 14 to a ticket management system 16 arranged to control and coordinate distribution of tickets. In this embodiment, the ticket 8489370_1 (GHMatters) P75811 AU.5 2016269454 06 Dec 2016 6 management system 16 implements a lottery in which the gaming machines 12 participate, so that players of the gaming machines 12 have an opportunity to win a prize associated with the lottery. 5

Each ticket 22 is allocatable to a gaming machine 12 based on at least one ticket allocation criterion. For example, a ticket may be allocated to a gaming machine 12 when the turnover of the gaming machine reaches a turnover 10 milestone, when the turnover reaches each of a series of turnover milestones, when a special bet is placed, when a specific period of time has elapsed since a ticket was allocated, based on the number of games played on the gaming machine, or when a specific symbol or symbol 15 combination occurs such as when one or more winning outcomes occur at the gaming machines. However, it will be understood that any suitable ticket allocation criteria are envisaged. In this embodiment, it will be understood that tickets 22 are allocated to a plurality of gaming 20 machines 12, with each ticket 22 providing a gaming machine 12 with a stake in a lottery.

In this example, each ticket 22 includes a ticket identifier 24 which serves to distinguish the ticket 22 25 from all other tickets 22 in the current lottery, and a gaming machine identifier 26 indicative of the gaming machine 12 to which the ticket 22 is allocated.

In one embodiment, operation is such that a plurality of 30 virtual tickets 22 are created by the ticket management system 16 and stored in a ticket memory 20.

In an alternative embodiment, operation is such that a plurality of actual tickets are created, for example by 35 printing the tickets at the gaming machines 12. A prize pool associated with the lottery may be created by 8489370_1 (GHMaUers) P75811 AU.5 2016269454 06 Dec 2016 7 allocating a credit amount from each gaming machine 12 to the lottery each time a ticket 22 is allocated to the gaming machine 12. For example, each gaming machine 12 may contribute a credit amount to the prize pool when the 5 ticket 22 is allocated to the gaming machine 12. The credit amount may vary, for example the credit amount may increase as the number of allocated tickets 22 increases.

As an alternative, the prize pool may accumulate in other 10 ways, for example based on gaming machine turnover, and tickets may be allocated to gaming machines 12 without the need for the gaming machines to contribute a credit amount. 15 In this embodiment, one or more tickets corresponding to a winning outcome are determined by carrying out a lottery draw, for example by randomly selecting at least one ticket. In an alternative embodiment, one or more tickets corresponding to a winning outcome are determined by 20 randomly indicating on at least one ticket information indicative of whether the ticket corresponds to a winning outcome. With this embodiment, the tickets may be in the form of scratch cards . 25 Example operative components of the ticket management system 16 are shown in Figure 2.

In the present example, the operative components include a network interface 28 which facilitates communications 30 between the ticket management system 16 and the gaming machines 12 through the gaming network 14, and a processor 30 arranged to control and coordinate operations in the ticket management system 16 in accordance with programs 32 stored in a memory 34. 35

The programs in the memory 34 define operation in relation to ticket allocation criteria 36 which govern allocation 8489370_1 (GHMatters) P75811.AU.5 2016269454 06 Dec 2016 8 of tickets 22 to the gaming machines 12, and in this example draw criteria 38 which govern ticket draws such as when and how many tickets to draw. In the present example, a predetermined number of tickets are created at 5 commencement of the lottery, a ticket 22 is allocated to a gaming machine 12 when the turnover of the gaming machine reaches a predetermined milestone or each time the turnover reaches one of several predetermined milestones, and the ticket draw occurs when the prize pool reaches a 10 predetermined amount. However, variations are possible. For example, the ticket management system 16 may be arranged so as to draw the lottery when a predetermined number of tickets have been allocated to the gaming machines 12, or the ticket management system 16 may be 15 arranged so as to draw the lottery when a pseudo randomly selected number of tickets have been allocated when the prize pool reaches a pseudo randomly selected amount, or after a pseudo randomly defined period of time. For this purpose, the ticket management system 16 may also include 20 a random number generator 40.

It will be understood that any number of tickets may be drawn in each lottery draw and that the amount of each prize may be fixed or variable for example by pseudo 25 randomly selecting the prize amount.

In embodiments wherein the lottery is drawn prior to allocation of all available tickets 22, it is possible that not all available prizes will be won. With this 30 arrangement, unallocated prizes may be carried over to the next lottery draw. In a variation of this embodiment, the ticket management system 16 may be arranged so as to carry out a lottery draw prior to allocation of the total number of allocatable tickets for n successive lottery draws, and 35 on the (n+l)th draw to carry out the lottery draw only when all tickets have been allocated so that all prizes are won. 8489370_1 (GHMatters) P75811.AU.5 2016269454 06 Dec 2016 9

An example gaming machine 12 is illustrated in Figure 3. The gaming machine 12 includes a console 42 having a display 44 on which is displayed representations of a game 5 46 that can be played by a player. A mid-trim 50 of the gaming machine 12 houses a bank of buttons 52 for enabling a player to interact with the gaming machine, in particular during game play. The mid-trim 50 also houses a credit input mechanism 54 which in this example includes 10 a coin input chute 54A and a bill acceptor 54B. Other credit input mechanisms may also be employed, for example, a card reader for reading a smart card, debit card or credit card. 15 A top box 56 may carry artwork 58, including for example pay tables and details of bonus awards and other information or images relating to the game. Further artwork and/or information may be provided on a front panel 59 of the console 42. A coin tray 60 is mounted 20 beneath the front panel 59 for dispensing cash payouts from the gaming machine 12.

The display 44 is in the form of a video display unit, particularly a cathode ray tube screen device. 25 Alternatively, the display 44 may be a liquid crystal display, plasma screen, or any other suitable video display unit. The top box 56 may also include a display, for example a video display unit, which may be of the same type as the display 44, or of a different type. 30

The display 44 is arranged to display representations of several reels, each reel of which has several associated symbols. Typically 3, 4 or 5 reels are provided. During operation of the game, the reels first appear to rotate 35 then stop with typically three symbols visible on each reel. Game outcomes are determined on the basis of the visible symbols together with any special functions 8489370J (GHMaUers) P75811 AU.5 2016269454 06 Dec 2016 10 associated with the symbols, and if a function has been allocated to a reel, on the basis of the allocated function . 5 Alternative gaming machines including physical reels, and gaming machines arranged to implement other types of games such as bingo, keno, card games, or pin and ball games are also envisaged. 10 A player marketing module (PMM) 62 having a display 64 is connected to the gaming machine 12. The main purpose of the PMM 62 is to allow the player to interact with a player loyalty system. The PMM has a magnetic card reader for the purpose of reading a player identification device, 15 for example as part of a loyalty program. However other reading devices may be employed and the player tracking device may be in the form of a card, flash drive or any other portable storage medium capable of being read by the reading device. In this example, the PMM 62 is a Sentinel 20 III device produced by Aristocrat Technologies Pty Ltd.

Figure 4 shows a block diagram of example operative components 70 of the gaming machine 12 shown in Figure 3. 25 The operative components 70 include a game controller 71 having a processor 72. Instructions and data to control operation of the processor 72 in accordance with the present invention are stored in a memory 74 which is in data communication with the processor 72. 30

Typically, the operative components 70 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 74. 35

Figure 5 shows a block diagram of the main components of an exemplary memory 74. The memory 74 includes RAM 75A, 8489370.1 (GHMaUers) P75811.AU.5 2016269454 06 Dec 2016 11 EPROM 75B and a mass storage device 75C. The RAM 75A typically temporarily holds program files for execution by the processor 72 and related data. The EPROM 75B may be a boot ROM device and/or may contain some system or game 5 related code. The mass storage device 75C is typically used to store game programs, the integrity of which may be verified and/or authenticated by the processor 72 using protected code from the EPROM 75B or elsewhere. 10 In this embodiment, the gaming machine also comprises hardware meters 76 for purposes including ensuring regulatory compliance and monitoring player credit, an input/output (I/O) interface 78 for communicating with a player interface 79 of the gaming machine 12, the player 15 interface 79 having several peripheral devices. The input/output interface 78 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 20 random number generator module 94 generates random numbers for use by the processor 72.

In the example shown in Figure 4, the peripheral devices that communicate with the game controller 71 comprise one 25 or more displays 80, a touch screen and/or bank of buttons 82, a card and/or ticket reader 84, a printer 86, a bill acceptor and/or coin input mechanism 88 and a coin output mechanism 90. Additional hardware may be included as part of the gaming machine 12, or hardware may be omitted as 30 required for the specific implementation.

In addition, the operative components 70 include a communications interface, for example a network card 92 which enables the gaming machine 12 to communicate with 35 the gaming network 14. 8489370_1 (GHMatters) P75811.AU.5 2016269454 06 Dec 2016 12

Operation of the gaming system 10 will now be described with reference to flow diagram 100 shown in Figure 6 which illustrates steps 102 to 114 of a method of gaming in accordance with an embodiment of the invention. In this 5 embodiment, the gaming system is of a type arranged to create virtual tickets 22 and allocate the virtual tickets to a plurality of gaming machines.

As illustrated in Figure 6, a plurality of virtual tickets 10 22 are first generated 102 by the ticket management system 16 in accordance with programs 32 stored in the memory 34, and based on ticket allocation criteria 36 stored in the memory 34 tickets are allocated 108 to the gaming machines 12 associated with the gaming system 10. Ticket 15 allocation in this example is triggered by receipt at the ticket management system 16 of a communication from a gaming machine, for example indicative that the machine has reached a specific turnover threshold, and allocation occurs by sending an allocation communication from the 20 ticket management system 16 to the gaming machine 12. When draw criteria 38 stored in the memory 34 are satisfied 110, for example when a pseudo randomly determined number of tickets 22 have been allocated, a predetermined number of virtual tickets 22 are drawn 112 and prizes are awarded 25 114 to players of gaming machines associated with the drawn tickets .

While the above embodiments are described in relation to a gaming system which includes a plurality of gaming 30 machines and a ticket management system in networked relationship to the gaming machines, it will be understood that other arrangements are possible. For example, the or each gaming machine may include a ticket management system or some aspects of the ticket allocation system 16 so that 35 game implementation including allocation of tickets and determining whether an allocated ticket corresponds to a winning outcome occur at the gaming machine. With this 8469370.1 (GHMatters) P75811AU.5 2016269454 06 Dec 2016 13 arrangement, it is not necessary to include in the tickets a gaming machine identifier 26

While the above embodiment is described in relation to a 5 gaming system and a ticket management system which implements a lottery wherein tickets are distributed to participating gaming machines and at least one of the tickets is drawn to determine a winning ticket, other arrangements are envisaged. For example, the ticket 10 management system 16 may be arranged so as to distribute tickets to participating gaming machines 12 with each ticket or at least some of the tickets having information indicative of an associated award included in the ticket. The award may be a credit award, one or more free games, a 15 feature option, and so on.

In one embodiment, instead of providing virtual tickets actual tickets are printed at the gaming machines. 20 In one embodiment, the actual tickets are in a form such that the tickets themselves provide an indication to players as to whether an award has been received, for example in the form of scratch cards. In this way, drawing tickets to determine one or more winning tickets 25 is not necessary.

It will also be understood that although the above embodiments are described in relation to a gaming system wherein on lottery type game is implemented, it is 30 envisaged that multiple lottery type games may be implemented simultaneously. For example, a jackpot lottery may be implemented at the same time as a minor prize lottery, with different allocation criteria being used for the jackpot and minor prize lotteries. 35

It will also be appreciated that entitlement to receive tickets may be dependent on player loyalty criteria, for 8489370_1 (GHMatters) P75811.AU.5 2016269454 06 Dec 2016 5 14 example such that only players interacting with the gaming machine using the PMM 62 are able to receive tickets.

Modifications and variations as skilled addressee are deemed to present invention. would be apparent to a be within the scope of the 8489370_1 (GHMatters) P75811.AU.5

Claims

Claims :

1. A ticket management system for a gaming system comprising a plurality of gaming machines, the ticket management system being arranged to allocate tickets to at least some of the gaming machines in accordance with at least one allocation criterion; wherein an award is provided to a player of a gaming machine when a ticket allocated to the gaming machine corresponds to a winning outcome; and wherein the ticket management system is arranged to draw at least one ticket when a predetermined number of tickets less than the total number of available tickets have been allocated, the drawn ticket corresponding to a winning outcome.
2. A ticket management system as claimed in claim 1, wherein the ticket management system is arranged to draw at least one ticket when a pseudo randomly selected number of tickets less than the total number of available tickets have been allocated.
3. A ticket management system as claimed in claim 1, wherein the ticket management system is arranged to draw at least one ticket when a specific period of time has elapsed since a ticket was drawn.
4. A ticket management system as claimed in claim 1, wherein the ticket management system is arranged such that for n successive ticket draws the ticket management system draws at least one ticket when a predetermined number of tickets less than the total number of available tickets have been allocated, and for an (n+l)th ticket draw the ticket management system draws at least one ticket when all available tickets have been allocated.
5. A ticket management system as claimed in claim 1, wherein at least one ticket includes information indicative of whether the ticket corresponds to a winning outcome .
6. A ticket management system as claimed in claim 5, wherein at least one ticket is in the form of a scratch card.
7. A ticket management system as claimed in any one of the preceding claims, wherein the award is a credit prize, at least one feature award, or at least one free game.
8. A ticket management system as claimed in any one of the preceding claims, wherein at least one ticket is printed by a gaming machine.
9. A ticket management system as claimed in any one of claims 1 to 5, wherein at least one ticket is a virtual ticket.
10. A ticket management system as claimed in any one of the preceding claims, wherein the ticket management system is arranged to allocate tickets to a gaming machine when the turnover of the gaming machine reaches a predetermined turnover milestone.
11. A ticket management system as claimed in any one of claims 1 to 19, wherein the ticket management system is arranged to allocate virtual tickets to a gaming machine when a specific number of games have been played by the gaming machine.
12. A ticket management system as claimed in any one of claims 1 to 9, wherein the ticket management system is arranged to allocate virtual tickets to a gaming machine when a specific game outcome occurs.
13. A ticket management system as claimed in claim 12, wherein the ticket management system is arranged to allocate a ticket to a gaming machine based on one or more winning outcomes at the gaming machine.
14. A ticket management system as claimed in any one of claims 1 to 9, wherein the ticket management system is arranged to allocate virtual tickets to a gaming machine when a special bet is placed by a player.
15. A ticket management system as claimed in any one of claims 1 to 9, wherein the ticket management system is arranged to allocate virtual tickets to a gaming machine when a specific period of time has elapsed since a ticket was allocated.
16. A ticket management system as claimed in any one of the preceding claims, further comprising a prize pool, the ticket management system being arranged so as to increase the prize pool as the number of allocated tickets increases .
17. A ticket management system as claimed in claim 16, wherein each gaming machine contributes a credit amount to the prize pool when a ticket is allocated to the gaming machine .
18. A ticket management system as claimed in claim 16 or claim 17 when dependent on claim 2, wherein the ticket management system is arranged to draw at least one ticket when the prize pool reaches a predetermined amount.
19. A ticket management system as claimed in claim 16 or claim 17 when dependent on claim 2, wherein the ticket management system is arranged to draw at least one ticket when the prize pool reaches a pseudo randomly selected amount.
20. A ticket management system as claimed in any one of the preceding claims, comprising a processor and a memory arranged to store programs, information indicative of tickets, and allocation criteria and draw criteria usable by the control unit.
21. A gaming system comprising: a plurality of gaming machines; and a ticket management system as claimed in any one of claims 1 to 20.
22. A method of gaming comprising: providing a plurality of gaming machines; allocating at least one ticket to at least some of the gaming machines in accordance with at least one allocation criterion; awarding a prize to a player of a gaming machine when a ticket allocated to the gaming machine corresponds to a winning outcome; and drawing at least one ticket when a predetermined number of tickets less than the total number of available tickets have been allocated, the drawn ticket corresponding to a winning outcome.
23. A method as claimed in claim 22, comprising drawing at least one ticket when a pseudo randomly selected number of tickets less than the total number of available tickets have been allocated.
24. A method as claimed in claim 22, comprising drawing at least one ticket when a specific period of time has elapsed since a ticket was drawn.
25. A method as claimed in claim 22, wherein the ticket management system is arranged such that for n successive ticket draws the ticket management system draws at least one ticket when a predetermined number of tickets less than the total number of available tickets have been allocated, and for an (n+l)th ticket draw the method draws at least one ticket when all available tickets have been allocated.
26. A method as claimed in claim 22, comprising providing at least one ticket with information indicative of whether the ticket corresponds to a winning outcome.
27. A method as claimed in claim 26, wherein at least one ticket is in the form of a scratch card.
28. A method as claimed in any one of claims 22 to 27, wherein the award is a credit prize, at least one feature award, or at least one free game.
29. A method as claimed in any one of claims 22 to 28, comprising printing at least one ticket by a gaming machine .
30. A method as claimed in any one of claims 22 to 26, wherein at least one ticket is a virtual ticket.
31. A method as claimed in any one of claims 22 to 30, comprising allocating tickets to a gaming machine when the turnover of the gaming machine reaches a predetermined turnover milestone.
32. A method as claimed in any one of claims 12 to 30, comprising allocating virtual tickets to a gaming machine when a specific number of games have been played by the gaming machine.
33. A method as claimed in any one of claims 22 to 30, comprising allocating virtual tickets to a gaming machine when a specific game outcome occurs.
34. A method as claimed in claim 33, comprising allocating a ticket to a gaming machine based on one or more winning outcomes at the gaming machine.
35. A method as claimed in any one of claims 22 to 30, comprising allocating virtual tickets to a gaming machine when a special bet is placed by a player.
36. A method as claimed in any one of claims 22 to 30, comprising allocating virtual tickets to a gaming machine when a specific period of time has elapsed since a ticket was allocated.
37. A method as claimed in any one of claims 22 to 36, comprising providing a prize pool and increasing the prize pool as the number of allocated tickets increases.
38. A method as claimed in claim 37, comprising contributing a credit amount to the prize pool from a gaming machine when a ticket is allocated to the gaming machine .
39. A method as claimed in claim 37 or claim 38 when dependent on claim 23, comprising drawing at least one ticket when the prize pool reaches a predetermined amount.
40. A method as claimed in claim 37 or claim 38 when dependent on claim 23, comprising drawing at least one ticket when the prize pool reaches a pseudo randomly selected amount.
41. A method as claimed in any one of claims 22 to 40, comprising a processor and a memory arranged to store programs, information indicative of tickets, and allocation criteria and draw criteria usable by the control unit.