A gaming machine 10 has a display 14 and a game controller arranged to
control images of symbols displayed on the display 14. The game
controller is arranged to play a game 16 in which at least one random
event is caused to be displayed on the display 14. If a predefined
winning event occurs, the machine 10 awards a prize to a player. When a
trigger condition occurs in a base game of the game 16, a bonus game
feature is awarded comprising a series of bonus games. If a particular
special symbol outcome occurs during any of the bonus games, the
particular special symbol outcome is collected towards a jackpot prize
awarding event.