Patent ID: 8425301

Claim:
A gaming system having a controller, the controller comprising a symbol selector arranged to select a plurality of symbols from a set of symbols; an outcome generator arranged to determine a game outcome based on the selected symbols, the outcome generator being further arranged to select, without input from a player, at least one first symbol to be stored; a symbol store arranged to store the at least one first symbol, wherein the symbol store stores the at least one first symbol in response to the game outcome comprising at least one predefined symbol; and wherein the outcome generator being further arranged to determine whether to substitute the at least one first symbol stored in the symbol store for one or more of the selected symbols to determine a game outcome, and wherein the outcome generator being further arranged to determine whether to substitute the at least one first symbol stored in the symbol store with at least one second symbol from the plurality of symbols selected for a game if the at least one second symbol is determined to be more favourable symbol than the at least one first symbol.