A method of gaming, a game controller and gaming system

Abstract A method of gaming comprising: generating game outcomes for game rounds by selecting symbols for display at a 5 plurality of display positions on a display, the display positions being divided into a plurality of subsets of display positions and the selection of symbols for each subset of display positions being made from different ones of a plurality of symbol sets; and making a modification 10 to generation of the game outcome for at least one subsequent game round in response to determining that a condition is met, the modification comprising causing a designated set of symbols to be displayed for one of the subsets of display positions while continuing to select is symbols for the other subsets. 3191639_1 (GHMatters) P74424AU. I 2/03/12