A gaming machine comprising a display, and a game controller that at least: selects a first set of symbols, causes the display to display the first set of symbols at a first set of display positions and conducts a random selection process so that a second set of display positions has an overlapping spatial relationship with a first set of display positions. The random selection process includes a first type of outcome where a designated number of special symbols is selected and a second type of outcome where less than the designated number of special symbols is selected. Upon the occurrence of the second type of outcome, the game controller displays the less than the designated number of special symbols selected at either individual ones of the first set of display positions or of the second set of display positions, and triggers a feature game for conducting feature game play.