text: in a preferred embodiment of the invention , a new jackpot trigger mechanism provides the casino operator with a far higher degree of flexibility . unlike conventional combination triggered jackpots , the jackpots here are won from a feature game . the feature game is triggered randomly as a function of credits bet per game . when a feature is triggered , a feature game appears . each jackpot can only be won from this feature game . during the feature game a second set of reel strips appears and a “ spin and hold ” feature game commences . the feature prize score is calculated by the total of the points appearing on the centre line of all 5 reels . feature jackpots in this format exhibit significant differences over previous jackpot systems : ( i ) a jackpot game is provided which is compatible with any existing game combination within an installation independent of the platform , denomination or type of game ( e . g . slot machines , cards , keno , bingo or pachinko ) this will allow for the linking of combinations between game type , platform type and denomination . using this system , jackpot games can now be developed using specific combinations for the base game which were previously unsuitable for link progressive systems . these games will compete with the appeal of the latest games on the market . ( ii ) there is no longer a need to develop mathematically exact combinations in the base game . ( iii ) unlike the multiplier game in combination triggered jackpot embodiments , the present invention provides a direct relationship between the number of credits bet and the probability of winning the jackpot feature game on any one bought game . betting 10 credits per line will produce ten times as many , hits into the feature game than betting 1 credit per line . this is achieved by using a jackpot trigger which is directly related to the wager bet on a respective game and the turnover , instead of using conventional combination triggers . ( iv ) jackpot hit rates can now be changed without making changes to the base game . this was previously not possible using combination triggered jackpots . ( v ) the jackpot feature system can be used across a wide - area - network ( wan ), local - area - network ( lan ), used as a stand - alone game independent of a network or used with a mystery jackpot flexibility is available to change combinations at will . referring to fig1 a plurality of electronic gaming consoles 10 are connected to a network 11 , to which a feature jackpot controller 12 and display means 13 are also connected . each of the electronic gaming consoles 10 are provided with a network interface arranged to provide a signal onto the network 11 on each occurrence of an operation of a respective console and the jackpot controller 12 is arranged to receive each of the console operation signals and to increment the value of a random jackpot prize on the occurrence of each of these operation signals . a flow chart for a prize awarding algorithm is illustrated in fig2 . referring to the algorithm of fig2 , machine contributions go into the prize pool as with known prior art jackpot systems , while the overhead display shows the incrementing prize value . in the emg , an average value of machine turnover between jackpot hits , is programmed and is used to randomly generate trigger data for the jackpot feature games . in step 20 of the algorithm of fig2 , the actual number range and therefore probability of a feature jackpot game being awarded will depend upon the value of a credit in the particular machine and is calculated by dividing the turnover value by the value of a credit ( e . g ., $ 5000 /$ 0 . 05 = 100 , 000 ). the average turnover value is fixed for the egms and the random number generator is initialised ( see step 20 ) at startup to generate numbers from the preprogrammed range determined from that value . for every game that is played , a random trigger value is selected ( see step 21 ) in the preprogrammed range as determined from the average turnover value . when the game is commenced , it is then reported ( see step 22 ) to the controller , which allocates a contribution to the prize pool . each game is also allotted ( see step 23 ) numbers from the same number range that from which the random number was selected , one number in the range being allotted for each credit bet such that the player &# 39 ; s probability of being awarded a jackpot feature game is proportional to the bet . the previously selected random number is then used as a trigger value and compared with the values allotted to the player , if there is a match ( see step 24 ) between the trigger value and the player values , the player is given an opportunity to play a jackpot feature game ( see step 25 ). alternatively , at step 23 , a number is allocated which is equal to , or proportional to the number of credits bet in the respective game and in step 24 , the trigger value is compared with the single player value and a jackpot feature awarded if the trigger value is less than or equal to the player value . it will be appreciated that this alternative arrangement is mathematically equivalent to the previously described arrangement , the range of numbers below the allotted number in the alternative arrangement being equivalent to the set of allotted numbers in the previously described arrangement in the preferred embodiment , a prize is always awarded in the jackpot feature game , the feature game being used to determine the size of the prize to be awarded ( see step 27 ). the winning machine is then locked up ( see step 28 ) and the controller awaits an indication that the prize has been paid before allowing the machine to be unlocked ( see step 29 ). in some embodiments , the machine will not be locked up in steps 28 and 19 , but instead the prize will simply be paid and the program will return to step 21 . the machine then returns to step ( see step 21 ) and commences a new game . if the trigger value does not match ( see step 27 ) then there is no feature game awarded for that bought game and the machine returns to step ( see step 22 ) and waits for the next game to commence . by way of example , a feature game might be triggered by an egm every $ 5000 of turnover played , which is equivalent to 100 , 000 credits on a $ 0 . 05 machine . this is referred to as the jackpot feature game hit rate in credits . a random number is generated within a prescribed range of numbers at the egm at the commencement of each bought game . the prescribed range of numbers is determined by the jackpot feature game hit rate which has been determined previously , from typical values of casino turnover , expected jackpot amounts and jackpot frequencies . the prescribed range in this example is therefore 1 to 100 , 000 and before the commencement of each bought game a random number is generated within this range . a bet of 20 credits will result in the numbers between 1 and 20 ( inclusive ) being allotted to the game ( note that statistically it does not matter if the numbers are randomly selected or not or allotted as a block or scattered , the probability of a feature game being awarded is unchanged ). if the number 7 is produced by the random number generator , then the feature game will be triggered . if any number between 21 and 100 , 000 is produced by the random number generator , the feature game will not be triggered . similarly , a bet of 200 credits will result in the numbers between 1 and 200 ( inclusive ) being allotted to the game . if any number between 1 and 200 is produced by the random number generator , then the feature game will be triggered . if any number between 201 and 100 , 000 is produced by the random number generator , the feature game will not be triggered . the example below has been developed using example turnover data . a trigger of the second screen feature game is expected every $ 5000 of turnover ( i . e . 100000 credits on a $ 0 . 05 machine ). increasing the number of credits bet increases the chance of triggering the feature on any bought game . preferably , when a jackpot feature game is triggered , all players are alerted by a jackpot bell that a possible grand jackpot is about to be played for . this is done so that all players share in the experience of a jackpot win . anecdotal evidence of players watching feature games being played in australian casinos suggests that the drawing power of such games is immense . players are alerted by the jackpot bell instantaneously at any point during a game , but the feature game will not appear until the current game ( including base game features ) are completed . in this embodiment the feature game appears with the new reel strips already spinning and accompanying feature game tunes playing . the player stops the reels spinning by pressing the corresponding playline buttons in order . the feature prize score is calculated by the total of the points appearing on the centre line of all 5 reels . across the top of the screen , a sum of the score is displayed . the 4 feature prize meters in descending order of value are : ( i ) grand feature prize . a score of ≧ 100 wins the grand feature jackpot ; ( ii ) major feature prize . a score of 90 - 99 ( inclusive ) wins the major feature jackpot ; ( iii ) minor feature prize . a . score of 80 - 89 ( inclusive ) wins the minor feature jackpot ; ( iv ) mini feature prize , a score of ≦ 79 wins the mini feature jackpot . by way of example , referring to fig3 , a 5 reel by 3 row window is displayed . if the reels of the feature game stop on the numbers shown in fig3 , then the progressive jackpot won is the sum of the numbers on the center line i . e ., 12 + 10 + 18 + 13 + 22 = 75 which is within the range for the mini feature jackpot . the instant the feature game is completed and the sum of scores from all 5 reels is shown , the feature jackpot screen and signs display which jackpot has been won . this celebration of the jackpot win is conducted in a traditional manner ( i . e . flashing displays , jackpot alarms , music etc .) as the time between jackpot game awards is related to turnover , the number of jackpot games played by a player between feature games and hence their chance of winning is directly related to the size of each bet on each game played . ( 1 ) all machines on the link have a feature game , be it a second screen animation game or a second set of reel strips . ( 2 ) the link has a number of feature jackpot meters ( up to 8 ). all feature jackpots may be linked . ( 3 ) the feature game is activated as a function of machine turnover . this means that on average the feature game will occur one in , for example every $ 5000 . 00 . there are a number of advantages of activating the feature game on turnover . for example , it enables for the first time , a relatively simple mechanism for allowing mixed denomination on a link . the feature game gives the player the chance of winning one of the available feature jackpots if a certain outcome appears . for example , a new set of reel strips might appear with only 2 or 4 different symbols : jackpot 1 , jackpot 2 , or ( jackpot 1 , jackpot 2 , jackpot 3 , jackpot 4 ). the first time 5 of the same appear on the centre line the stated feature jackpot is won . ( 4 ) another advantage of using a random trigger for a feature game , is that it can be applied to any game . it will be appreciated by persons skilled in the art that numerous variations and / or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly described . the present embodiments are , therefore , to be considered in all respects as illustrative and not restrictive .