Happy Mouse is one of antagonists in Five Nights at Treasure Island 2: Let the Show Begin. He is a normal Mickey Mouse suit, but colored in gray-scale.
Happy Mouse bears a strong resemblance to the Mickey Mouse as first depicted in his early cartoons, as all of his colors are in gray-scale and his features match the original cartoon Mickey Mouse. But with dusty look, torn like eyes and teeth He walks around with his hands tucked behind his back.
In version 3 and the final version, Happy Mouse has widened eye sockets and a dusty texture.
When Happy Mouse starts, starts Suicidemouse.avi on piano like music. Then he will enter the other rooms on his path, going directly toward the player unlike most other suits. When he enters The Office, the player must make sound somewhere in building, If the player fails to do this in time, Happy Mouse will attack the player.
Happy Mouse starts in Backstage 2 along with Abandoned Daisy, Locations where he can go through are: