This is disclosed an electronic method of gaming. The method comprises selecting a symbol for display at each display position of a plurality of sets of display positions (710), modifying the displayed symbols by interchanging a first set of symbols displayed at a first set of display positions with a second set of symbols displayed at a second set of display positions (740), and determining whether to make an award based on the symbols displayed at the plurality of sets of display positions as modified 750. There is also disclosed a gaming system, a game controller and a gaming machine corresponding to the electronic method.