Slot machine game-progressive jackpot with decrementing jackpot

A method of awarding a random prize comprising one or more gaming consoles, each of the one or more gaming consoles being arranged to play a first game and second game, the first game being a standard game normally offered on the gaming console and the second game being a jackpot game offered for play when a player has achieved a trigger condition, the method including testing for a trigger condition and initiating an instance of the second game when the trigger condition occurs, the second game being divided into a plurality of sub-games, each sub-game when played, producing a sub-game outcome selected from a plurality of possible sub-game outcomes and at least one possible sub-game outcome of each sub-game having an incremental prize of the second game associated with it, such that a sum of un-won incremental prizes equals a total currently available jackpot prize value of the second game, the player being awarded each sub-game after a first sub-game, only if the incremental prize was won in a previous sub-game and the jackpot prize value being decremented by the incremental prize value awarded with an occurrence of each prize winning sub-game.