Ultra Stack Bisonâ¢
This clone of the earlier released Ultra Stack Happy Lionâ¢ is played at a recommended denomination of 1Â¢ with a minimum of 50 credits. Throughout the base games, this medium volatility game offers mid-level wins that are hit regularly giving players more entertainment time during their game play. Three FEATURE symbols appearing on reels 2, 3, and 4 trigger the ULTRA STACK FREE GAMES. During the ULTRA STACK FREE GAMES, 8 FREE GAMES are awarded and all reels are changed to bonus reels with additional top symbols. During the much anticipated bonus spins, the enormous bison show up on the reels in herds bringing players bigger wins more frequently and a higher chance of winning a full stack of bison for a top award.