A gaming machine has a display and a game controller arranged to control images on the display. The game controller is arranged to playa game wherein one or more random events are caused to be displayed on the display and, if a predefined winning event of combination of events results, the machine awards a prize. A predetermined symbol from a set of symbols of the game is selected as a bonus symbol. The display is an interactive display means such that, when at least one of the bonus symbols appears then, by a player touching a part of the display overlying the, or each, occurrence of the bonus symbol, a bonus prize is revealed in respect of the, or each, bonus symbol.