Helloween is a 10-pay line, 5-reel video slot game that pays left to right.
When a Scatter symbol appears on reels 1, 3, and 5, the Keeper of the Seven Keys features wheel is activated, allowing players to choose from one of seven features. Except for Helloween Free Spins, which provides 7 Free Spins, each feature awards 5 Free Spins. Also serving as Wilds are scatters. The I’m Alive, Future World, Eagle Fly Free, Dr Stein, March of Time, and I Want Out features do not offer scatters.
When a reel is filled, wild symbols that have landed in I’m Alive depart on the subsequent spin after being kept in place and expanding one position up or down on each spin. Any Wilds that land in Future World extends to fill the reel. In Eagle Fly Free, one Wild is flown onto the reels during each Free Spin and stays there during the whole spin, shifting positions. In Dr Stein, any occurrence of a randomly chosen royal symbol on the reels changes to Wild. Wilds in March of Time are kept on the reels and advance one spot to the left with each spin; however, once they reach reel 1, they vanish and are replaced by other symbols on the reels.
I Want Out’s wild symbols to increase to 2×2 symbols when they fall on the reels. With the potential to re-trigger the Keeper of the Seven Keys feature wheel, the Helloween Free Spins bonus round provides 7 free spins.
The Scatters are accumulated over spins in Helloween Free Spins. By gathering three Scatters, the Keeper of the Seven Keys feature wheel is activated. The feature wheel operates in the same manner and with the same characteristics as in the main game. A further 7 free spins will be added if the Helloween free spins are retriggered. The Scatter collecting meter resets after it is full, and any further Scatters are placed to the reels after the feature is activated. Following the activation of the feature wheel, the remaining free spins continue.
Following the completion of all features, there is a possibility at random to activate the Helloween Multiplier, which offers a total win multiplier of x2, x3, x5, or x10. The Multiplier in Helloween Free Spins may only be used at the very end of the feature and not during any features that are activated inside of Helloween Free Spins.