Patent ID: 8251794

Claim:
A method of operating a reel-type slot machine game on an electronic gaming machine comprising a processor having associated memory and operably coupled to a video screen for display of a number of reel positions, each reel position representing a reel employed to vary an outcome probability for each play of the slot machine game to an outcome, the method including: providing in memory at least one set of two or more different individual reel strip options for each of one or more reel positions of the number of reel positions, with each individual reel strip option differing in at least one of a number of symbol positions on the reel strip, frequency of occurrence of at least one symbol image, and a selection of symbol images from any other individual reel strip option of the set, each individual reel strip option providing a different probability of prize outcomes for the slot machine game; and the processor selecting, responsive to a previous game outcome responding with one or more predetermined game outcomes, one of the two or more different individual reel strip options from at least one set for use in at least one associated reel position in the slot machine game and for display on the video screen during play of the slot machine game.