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Slap Jack! is one of Kat and Ana's microgames in WarioWare: Twisted!. It is based on the fairy tale, "Jack and the Beanstalk". In the Japanese version, this microgame is instead based on the story Journey to the West.
The name of the microgame is a portmanteau of the words "slap" and "flapjack", which is another name for a pancake. It is also a pun on the card game "slapjack."
The player controls a giant's hand. The game's purpose is to make him slap Jack who passes by the vine. If done so, the game is won. However, if he misses, the player will lose.