ULTIMATE STACK™ GORILLA: Wild excitement builds from nature’s raw power. Select from three play options with increasing numbers of lines or a fourth option that includes max line play, a special area on the top of reels that extends the area where scatter symbols can appear, increases the number of wild symbols on reel 5, and makes the jackpot feature available. The free games feature consists of a randomly determined number of free games in which the reels contain a greater number of the top paying symbol.