A gaming system comprising presentation means for presenting selected symbols from a first and a second symbol reel with respective first and second sets of symbols in a display area, outcome determination means for determining an outcome from a first win line symbol from the first set and a second win line symbol from the second set, being the symbols from the first and second sets that are positioned along a win line in the display area, outcome replacement means for, upon occurrence of a predetermined event, selecting for the first win line symbol a first replacement symbol, selecting for the second win line symbol a second replacement symbol and causing the output determination means to determine the outcome from the first and second replacement symbols, wherein the first and second replacement symbols are positioned at an equal distance from the first and second win line symbols respectively.