Multiple different game symbol weighting sets are defined for selection in a given play of a reel-type game. Each game symbol weighting set defines a probability of each reel strip in the reel-type game landing at each particular stop position for that reel strip. By providing multiple different game symbol weighting sets, certain game symbols such as special themed game symbols may be favored for one or more plays of the game to increase the chance of hitting winning symbol combinations using that game symbol.