TOWER STACK BISON stands tall in a new stack series with 16 vertical reel positions and 4 progressive levels. Players can select to play up to 3 frames totaling 150 paylines. Playing the PLUS FACTOR ante bet adds an extra selectable play area according to reel angle, increases the number of wild on reel 5 and enables the jackpot challenge feature containing bonus credit prizes and 4 progressive levels.

• During PLUS FACTOR play, wild symbols are increased on reel 5 and the PILE’ EM UP jackpot challenge feature becomes enabled.
• During the free games, special reels with a greater number of the “Top” symbol are used.
• Play up to 3 frames, each with 50 lines, at the same time.