The Hulk symbol acts as a wild, and if it appears in the middle of the reel 3, it triggers the extended Hulk function. As the Hulk takes over the entire reel and rewards two re-spins, the intermediate reel acts as an expanding field. When the wild symbol appears on three intermediate reels (2, 3, and 4) at the same time, it will cause expansion to each reel and re-spin once. If the symbol appears on the 1st and 5th reels, be prepared to win the grand prize.