Patent ID: 8235797

Claim:
A gaming system that provides a game in which a plurality of symbols are selected from one or more symbol sets and presented on a display to form one or more combinations and if the combinations includes a winning combination, the gaming system awards an award, the gaming system awarding a jackpot dependent on the occurrence of a jackpot winning event that includes the occurrence of one or more jackpot symbols, the gaming system including a user interface in communication with a game controller that allows the player to select a wager, wherein if all other variables of the game remained constant at least one aspect of the wager is variable disproportionately to the probability of the jackpot being awarded, and wherein the size of at least one of the symbol sets from which the one or more jackpot symbols are selected is variable between game plays, dependent on said at least one aspect of the wager, so as to maintain at least an approximately constant probability of the jackpot being won despite variations in said at least one aspect of the wager; and wherein the game includes a base game and a feature game which is played when a trigger condition occurs during play of the base game, and wherein the jackpot is won from the feature game; and wherein the jackpot symbols occur in the feature game and the number of symbols in at least one of the symbol sets from which the jackpot symbols are selected is variable between game plays of the feature game, dependent on the first and/or second wager aspects of the wager made in the base game in which the trigger condition occurred; and wherein the probability of occurrence of the trigger condition is independent of both the first and second wager aspects of the wager made in the base game.