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Helloween is a 5-Reel video slot machine with 10 fixed pay lines, paying left to right. Landing a Scatter on reels 1, 3, and 5 triggers the Keeper of the Seven Keys feature wheel, where it is possible to trigger one of seven features—each feature awards 5 Free Spins, except Helloween Free Spins which award 7 Free Spins. Scatters also act as Wilds. Scatters are unavailable during the I'm Alive, Future World, Eagle Fly Free, Dr Stein, March of Time and I Want Out features. In I'm Alive, Wilds that land are held in place and expand up or down one place on each spin, after a reel is filled, they will disappear on the following spin. In Future World, any Wilds landing expands to fill the reel. In Eagle Fly Free, one Wild is flown onto the reels on each Free Spin, remaining on the reels and changing position on every spin. In Dr. Stein, all instances of a randomly selected royal symbol on the reels turn Wild on each spin. In March of Time, Wilds are held on the reels and move one space to try spin, once they have reached reel 1 they will disappear on the next spin. In I Want Out, Wilds that land on the reels expand in size to 2x2 symbols. Helloween Free Spins awards 7 Free Spins, with the chance to re-trigger the Keeper of the Seven Keys feature wheel.