In a gaming machine for playing a base game having a feature game with multiple levels: receiving a wager from a player for playing four instances of the base game, where the wager is deducted from a credit balance established by the player. Symbols for each of the four instances of the base game may be selected and displayed, where each instance displays the selected plurality of symbols in a matrix of display positions. The feature game may be initiated when the selected plurality of symbols includes a feature game trigger, where the feature game comprises a plurality of free plays of a number of instances of the base game based on a level of the feature game as determined by the feature game trigger, and the number of instances is one if the level is normal, four if the level is super, and eight if the level is extreme.