TOWER STACK SLIDE WOLF™, lead the wolf pack in this stack series game with 16 vertical reel positions and 4 progressive levels. During free games, any wolf symbol appearing on reel 1 slides to show a reel full of stacked wolf symbols. Any wolf symbols of the same kind appearing on other reels will then also slide to do the same. During special free games, it becomes even easier to get more sliding reels of stacked wolf symbols. 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.