1. AN ELECTRONIC GAMING MACHINE AND ASSOCIATED METHOD AND SOFTWARE The present invention relates to gaming apparatus and systems and in particular 5 to electronic gaming machines. Gaming machines have been a popular form of entertainment for many years. This popularity has been enhanced with the advent of electronic gaming machines and computer-based gaming systems, such as are provided over the Internet. Many different types of game are playable. They include for example standard 10 slot-machine type games with spinning reels, poker machines, keno, bingo, blackjack, roulette, pachinko and the like. A user will typically place a bet, press a button or pull a lever to begin a game, and will win or lose based upon the gaming machine's play algorithm and random number generator. 15 An aim of the present invention is to provide an electronic gaming machine having novel features for enhancing gameplay interest. According to a first aspect of the present invention there is provided an electronic gaming machine including: a component for monitoring gameplay; 20 a component for monitoring the occurrence of a game event; an event guarantee component for triggering a guaranteed game event if the monitored game event has not triggered within a set amount of gameplay; and a guarantee indicator component for providing a guarantee indicator that indicates the amount of gameplay that must occur before the guaranteed event is 25 triggered. According to a second aspect of the present invention there is provided a method of operating an electronic gaming machine, the method including the steps of: monitoring gameplay; monitoring the occurrence of a game event; 2. triggering a guaranteed event if the monitored event does not occur within a set amount of gameplay; and indicating the amount of guarantee gameplay remaining before a guaranteed event is triggered. 5 According to a third aspect of the present invention there is provided gaming software for use in an electronic gaming machine, said software including: a component for monitoring gameplay; a component for monitoring the occurrence of a game event; and an event guarantee component for guaranteeing that a game event will trigger 10 within a set amount of gameplay, the event guarantee component including: a trigger component for triggering a game event when the set guarantee gameplay amount is reached without the monitored event having been triggered, and an indicator component for indicating the amount of gameplay remaining to be played before a guaranteed game event will trigger. 15 According to a fourth aspect of the present invention there is provided an electronic gaming machine including: a gameplay monitor for monitoring user interactions with the electronic gaming machine; an event monitor for monitoring the occurrence of a game event; and 20 a guarantee feature for triggering a gaming event if the monitored event has not occurred within a set amount of gameplay and for indicating to a user the amount of gameplay remaining before the guarantee feature is triggered. According to another aspect of the present invention there is provided an electronic gaming machine including: 25 means for monitoring gameplay; means for monitoring the occurrence of a game event; and event guarantee means for guaranteeing that a game event will trigger within a set amount of gameplay, the event guarantee means including: a trigger component for triggering a game event when the set guarantee gameplay amount is reached without the 30 monitored event having been triggered, and an indicator means for indicating the amount 3. of gameplay remaining to be played before a guaranteed game event will trigger. Gameplay measurement can be based on e. g. the number of games played, e. g. the number of spins of a slot machine or the number of hands of a card game played, or the amount of bets laid, e. g. the amount of credits laid, the amount of lines or hands 5 played, or some other parameter indicative of an amount of gameplay. A game event may be of any suitable kind. It may be a type of win event or a type of feature event. A win event may for example relate to a win of a particular amount, e. g. a win over a set amount, or could relate to a win under a particular circumstance, e. g. a flush or 10 the like at poker or a set combination of slot machine reel symbols. It could also relate to a jackpot win, which could be e. g. for a stand- alone or linked jackpot system, and of a fixed or progressive kind. A feature event could for example include a free play scenario, a respin, a pick'n' win, or a game play that returns higher than usual wins. It may be a"second- screen" type 15 feature, which may involve a play that is extraneous to a main or basic game. The feature event could be e. g. a luck or skills-based feature. Some embodiments of the present invention provide a way of increasing the interest of a game. They provide a guarantee feature that can be of benefit to a gaming machine operator in that it promotes the use of the operator's machines, and can be of 20 benefit to users who can know that an event of benefit to the user will indeed occur within an amount of gameplay. The monitored event and the guaranteed event may be the same type of event, so that a user knows that for example if a "4 of a kind" does not occur normally within an amount of gameplay, then it will definitely occur at the end of the amount of gameplay, 25 or for example that a "free game" will definitely occur by the guarantee gameplay amount and will possibly occur beforehand. The monitored and guaranteed events do not however have to relate to the same event, and indeed a specific event need not be specified. For example, the monitored 4. event and/or guaranteed event may be one of a number of possible events, so that for example if none of the possible events occurs within the amount of gameplay, then one of a number of these or other events will be triggered to occur. Preferably, the predetermined amount of gameplay will be reset when a 5 monitored event occurs during normal play or when the guaranteed event occurs, and the virtual gauge will be reset to an initial gameplay amount. When reset, the guaranteed event may take a different form from that of the previous guarantee. This may be determined randomly or in accordance with a preset sequence and/or may vary based on previous gameplay. 10 Normal triggering of the monitored event, i. e. before the guarantee gameplay amount has been reached, may occur in any suitable manner. It may for example occur randomly, and/or on the basis of a particular set of circumstances, and/or over an accumulation of plays. It may also occur in relation to a device supplemental to the game itself, e. g. the triggering of a jackpot in a linked jackpot system. 15 Preferably, the apparatus includes a component for determining the play parameters for the guarantee feature. Thus, when a bonus game or the like is triggered, the play parameters may be e. g. the number of lines or hands played and the amount bet on each line or hand. When a win event is triggered, the play parameters may be the amount paid out or the win type. 2 0 The play parameters may be determined based on a user's play history, and may be an average of a user's play parameters over time, e. g. whilst the guarantee gameplay amount was accumulating. It could also be set to a specific value, or be determined randomly (e. g. within a set range). It could also or alternatively be varied based on a user's own bet requirements, e. g. a user may supplement or vary the bet. 25 The virtual gauge may display the play parameters that are to be used in the guarantee feature, and these may update as a user plays. In one preferred embodiment, the electronic gaming machine may provide more than one guarantee feature, and may include more than one virtual gauge. Thus, one 5. virtual gauge may display the amount of gameplay remaining until one event is guaranteed to trigger, and another virtual gauge may indicate the amount of gameplay remaining until another event is guaranteed to trigger. More than two guarantee features may also be used. These guarantee features 5 may be reset independently or together. The electronic gaming machine may also change the feature that it is monitoring with time, e. g. in view of a particular play circumstance or the like, e. g. in the case of games that may alter possible feature or win events during play. The present invention may be applied to an electronic gaming machine that 10 plays any suitable game, e. g. slot-machine type games, poker, keno, blackjack, bingo, roulette, pachinko, or the like. When part of a network, the guarantee feature of a particular electronic gaming machine (EGM) may be based on gameplay only of that particular device or may be based on the gameplay of other linked devices as well, e. g. all of the devices that are 15 taking part in a particular linked game or a subset of them. The guarantee feature may guarantee an event to an individual EGM or may guarantee an event to one of a number of the EGMs. Networked embodiments may include a central control for conducting games and managing the accounting and the like, and a number of remote EGMs that provide 20 user input and display mechanisms. The control of the feature guarantee may be carried out at the central control or at the EGMs, or may be split between the two. For example the central control may control all features of the virtual gauge on a remote screen, or the central control could set up the initial virtual gauge parameters for a remote screen, and the feature guarantee could then be controlled directly by the EGM software without 25 receiving any further direct instruction from the central control. The present invention extends to central controls/servers and to remote EGMs that are configured to carry out the feature guarantee of the present invention. Embodiments of the present invention will now be described, by way of example 6. only, with reference to the accompanying drawings. It is to be understood that the particularity of the drawings does not supersede the generality of the preceding description of the invention. In the drawings: 5 Figure 1 is a block diagram of an electronic gaming machine according to one embodiment of the present invention; Figure 2 is a generic gaming display screen shot including a feature guarantee virtual gauge according to an embodiment of the present invention; Figure 3 is a generic gaming display screen shot according to another 10 embodiment of the present invention; and Figure 4 is a flow diagram of a gaming control process in accordance with an embodiment of the present invention. Referring to Fig. 1, the electronic gaming machine (EGM) 1, includes various standard components, such as a controller 2 for controlling the operation of the EGM 1 15 and the games run on it, a coin/token/card input 3 for receiving bets, a coin/token/card output 4 for paying out winnings, a display 5 for displaying game screens, and user inputs 6 for allowing user interaction, which may include e. g. buttons 7 and which may e. g. be provided as part of the display 5 in a touch-screen type manner. The EGM 1 may be a stand-alone machine. It may also be networked with other 2 0 EGMs and/or a control centre via a suitable communications network 8, such as a LAN and/or WAN, in order to play networked (e. g. intranet or Internet) games, such as a linked jackpot. In use, the EGM 1 will display an initial gaming screen on the display 5. A player will insert coins, tokens and/or a payment card into the EGM input 3, and will 25 press a button 7 to initiate play. How matters then proceed will depend on the type of game being played. For example, in a slot machine-type game, the EGM 1 will display virtual reels of symbols, and will spin and stop these reels in various win and lose symbol combinations on a payline in accordance with a stored gaming algorithm and random number generator. Alternatively, in a poker-type game, a player will receive a number of 30 cards with which to play for a winning hand.
7. The player may interact with the machine via the buttons 7, so as e. g. to spin or hold reels, or to obtain and throw away cards. Whatever game is played, a common element will be win events, e. g. particular symbol or card combinations, that pay out a prize or jackpot. 5 Also, in order to increase interest, a game will often include feature events that may or may not relate directly to the game being played, and that generally provide a bonus of some sort. These feature events may include for example one or more free games, a respin (similar to a free game but with one or more reels held), a pick'n'win, the chance to play for higher winnings or the like. They may be e. g. luck or skills based. 10 They may be provided as "second screen" features that display on a new screen, and may be extraneous to the basic game. Another way of adding gaming interest is to include a wild feature, such as wild symbols or wild cards that can represent more than one type of symbol or card, and so can increase the chances of achieving a winning combination or the like. 15 These win and feature events can be arranged to occur randomly or under a particular set of circumstances, e. g. under a set symbol or card combination. They may also occur due to an accumulation of circumstances across a number of games, and may occur due to the condition of a device supplemental to the EGM 1 itself, e. g. they may relate to jackpot wins in linked jackpot systems comprising a plurality of EGMs under a 2 0 central control. In accordance with one embodiment of the present invention, the EGM 1 includes a guarantee feature, e. g. within the gaming algorithm. This requires the monitoring of one or more game events to determine whether they are triggered or not, and guarantees that a particular game event, or at least one of a number of possible game 25 events, will trigger within a predetermined amount of gameplay, if the standard conditions for triggering of the monitored game event or events are not met within that period of play. The EGM 1 generates a virtual gauge on the display 5 that indicates to a player 8. the guarantee count, i. e. the amount of gameplay remaining before the guaranteed event will be triggered. Gameplay may be measured by for example a measurement of user interaction with the gaming apparatus. For example, it may be based on the number of games played 5 or the amount of bets wagered. Thus, in accordance with this embodiment, a guarantee feature is provided by which a player or potential player will know the maximum amount of gameplay that can occur before at least one event is triggered, and this amount will decrease as play continues. A player or a potential player will know that even if they do not achieve the 10 standard conditions for a monitored game event, a guaranteed game event will trigger at the end of the guarantee count. The monitored event and the guaranteed feature event are in one embodiment the same event, so that a player knows that if they do not achieve the event normally, they will achieve it within the guarantee count. 15 The monitored and guaranteed event need not however be the same event. For example, the EGM could monitor a number of events, and if none occurs normally, could trigger a particular event, e. g. of a set value or type, or could trigger one event from a number of possible guarantee events that could e. g. be chosen at random. The monitored feature event may be any suitable type of event, e. g. a free game, 20 a free spin, a high payout game, or the appearance of a wild feature or other game advantage. It may be any event that can occur during the course of a game and that is advantageous and/or of interest to a player. It could also be a win event, e. g. of a particular amount or of a particular type. In one embodiment, the virtual gauge 9 will countdown from an initial number 25 that may represent the number of games to play before an event is guaranteed to trigger or may represent the remaining bet value that must be placed before the guarantee triggers. The initial count value may be a preset amount in accordance with e. g. a look up table or a sequence of numbers or the like, or may be randomly chosen e. g. using a 9. random number generator operating between some minimum and maximum gameplay values. If a monitored event occurs before the guarantee count has finished, then the count is reset, e. g. to its initial value, so as to start the count again. Thus, if a player 5 triggers an event prior to the end of the guarantee count, the guarantee count is restarted. The event or events guaranteed may be changed at each reset, e. g. randomly or in a set sequence or depending on gameplay. Fig. 2 is a generic gaming screen shot showing one way of implementing the virtual gauge 9. 10 The screen shot shows a number of virtual gaming reels 10 that are spun to provide symbol combinations in accordance with the rules of the gaming algorithm run by the controller 2. It also shows the display 5 having touch buttons 11. In the top right-hand corner of the display 5, the screen includes a virtual gauge 9 in the form of a numerical display, e. g. a countdown from an initial number of spins. 15 In another embodiment the virtual gauge may be in the form of a bar graph. When the countdown reaches zero, any appropriate feature event may be triggered in accordance with predetermined rules and/or randomly. The monitored event or events may take any appropriate form, and so the gaming apparatus may determine that one of a number of feature events may be triggered by the guarantee if no win and/or feature events have 20 occurred during the guarantee countdown or if only a win event or feature event of low value or interest where achieved during this period. The EGM 1 may provide more than one guarantee feature, and more than one virtual gauge 9 may then be displayed. For example, Fig. 3 shows an embodiment of the present invention in which a pair of virtual gauges 9a, 9b are provided. 25 In the embodiment shown, one virtual gauge 9a relates to a feature event, whilst the other 9b relates to a win event, and the monitored event is the same as the guaranteed event. Thus, virtual gauge 9a relates to a free game feature, which will definitely occur within 105 spins, if not earlier, whilst virtual gauge 9b relates to a "5 of a kind" win, 10. which will definitely occur within 76 games, if not earlier. It will be noted that virtual gauge 9a measures gameplay based on spins, whilst virtual gauge 9b measures gameplay based on "games", which in this context, means a payline played. Thus, if three paylines were played on one spin of the reels 10, count 9a 5 would countdown by one, whilst countdown 9b would countdown by three. Generally, the guarantees will count down until zero, at which time the appropriate event will trigger. If the particular event guaranteed occurs under normal play conditions, however, the guarantee indicator is reset to its initial value to begin the guarantee period again. 10 In this regard, both virtual gauges 9a and 9b could be reset at the same time, e. g. when either of the two monitored events occurs, or each could be reset independently, e. g. when their respective events occur. As mentioned above, it would also be possible for the monitored events to be different from the guaranteed events, so that the guaranteed events will occur if no other events occur in the meantime. 15 The virtual gauges 9a, 9b also display the play parameters under which the guaranteed events will occur. Thus, for the free game of virtual gauge 9a, the free game will play using 20 lines at a bet of 5 credits per line, whilst the 5 of a kind will be awarded at 3 credits per line. The play parameters may be chosen in any desired manner, and may be fixed or 20 may be randomly generated within certain ranges. In a preferred embodiment, the play parameters are determined based on a user play history. Thus, the number of lines played and/or the amounts bet may be averages of the lines played and bets placed over a number of the user's previous games. In this case, the guaranteed play parameters displayed may vary with play. 25 The averaging of a player's bet history or the like may produce a residual or rounding amount not used in the awarded play parameters. For example, a player may have 104 free credits built up that are split in the play parameters as 5 bets lines of 20 credits each. In this case, the residual 4 credits may be compensated by changing the odds 11. of a higher win or the like in the free game to favour the user, or by crediting the amount to the user. The credits required for the play parameters are preferably not deducted from a player's stake, i. e. the guaranteed event is a free event. It would however also be possible 5 to deduct the bet amounts from the player's stake, in which case the guaranteed event may pay out at higher odds or the like to give the event a bonus aspect. Fig. 4 shows an example of a flowchart for the control of the virtual gauge 9 by the controller 2. Thus, in one embodiment, the invention may be put into effect by the controller 2 running software that incorporates a subroutine executing in a manner similar 10 to that shown. The routine in entered at step SI when gameplay, e. g. a user play of some sort, occurs, e. g. when a start button is pressed. The controller 2 then determines at step S2 whether the resulting play has triggered the monitored event. If the answer is"no", control passes to step S3, where the guarantee count is 15 decremented by one, and to step S4, where the play parameters for the guaranteed event are recalculated, e. g. the average of the lines of play and the credits bet are adjusted by the play parameters of the game just played. The controller then determines at step S5 whether the guarantee count has reached zero. If no, the routine ends at step S6. If yes, the count is reset in step S7 in 20 readiness for a new guarantee period, and the guaranteed event is triggered at step S8 before the routine ends again in step S6. In step S7, the counter may be reset to the same initial countdown value as before, or could be set to a different value, e. g. based on a random number within a set range. 25 In step S8, the guaranteed event will begin with the play parameters calculated at step S4. If the answer at step S2 is"yes", i. e. the guaranteed event has been triggered due 12. to normal play conditions, then the guarantee count is reset in step S9, in a similar manner to step S7, and the play parameters are reset at step S10, e. g. to zero or a set minimum value (which may then be modified depending on the player's subsequent bets). The routine ends in step S6. 5 The routine shown will execute with every play of the game. It may be modified e. g. to vary the event that is guaranteed on each reset. The game played may take any suitable form. It could be e. g. a slot machine type game, poker, keno, bingo, pachinko, blackjack, roulette or any other suitable game. The virtual gauge could include a pointer on a scale. 10 The guarantee need not always relate to the same game event, and could change to the monitoring of a different game event e. g. depending on the state of play. After a player has finished a playing session, the guarantee may be reset, or may continue on for the next player, or may be stored in a player's history, so that the guarantee will resume from its previous status when the player returns to the game. 15 It is to be understood that various alterations, additions and/or modifications may be made to the parts previously described without departing from the ambit of the present invention, and that, in the light of the above teachings, the present invention may be implemented in software, firmware and/or hardware in a variety of manners as would be understood by a person skilled in the art.