A gaming machine having a display means and a game control means arranged to control images displayed on the display means, the game control means being arranged to play a game wherein at least one random event is caused to be displayed on the display means and, if a predefined winning event occurs, the machine awards a prize, wherein, when a special symbol is carried by a symbol-carrying element into a display position on the display means, the special symbol substitutes as more than one occurrence of a standard symbol of the game.