An electronic gaming machine includes a game controller, a player interface, and a display. The game controller causes the display to display a bonus array having visual elements. Each of the visual elements is uniquely associated with one of a plurality of symbol display positions, at least one visual element indicating a bonus award. The game controller selects a symbol for display at each of the symbol display positions, determines whether at least one of the symbol display positions contains a trigger symbol, and upon determining that the at least one of the symbol display positions contains a trigger symbol, determines a modification to a base prize based at least in part on a visual element associated with the symbol display position containing the trigger symbol.