Gaming system and method of gaming

A method of playing a game on a gaming machine having a credit input mechanism configured to receive a physical item associated with a monetary value for establishing a credit balance, the credit balance being increasable and decreasable based at least on wagering activity, a player interface, a display having a plurality of display position groups, each display position group comprising a plurality of display positions, and the display position groups defining a plurality of rows and a plurality of columns, and a game controller, the method comprising:

• establishing a credit balance via said credit input mechanism receiving a physical item;
• facilitating, via the player interface, a selection of an ante bet amount in accord with said credit balance;
• defining, via the game controller, the number of rows in the plurality of display position groups based on the ante bet amount selected;
• selecting, via the game controller, a plurality of symbols from a set of symbols for display in the defined number of rows of display positions;
• displaying at the defined number of rows of display positions the selected symbols;
• determining, via the game controller, whether the displayed symbols define a winning outcome;
• and
• allocating a prize when a winning outcome is displayed.