Psycho Fox is a video game made by Sega for the Sega Master System.

In Psycho Fox, an evil god named Madfox Daimyojin has corrupted the land. The people who want him gone send a hero, Psycho Fox, to get rid of the evil god.

The player takes control of Psycho Fox in this side-scrolling video game. Psycho Fox must get from the left hand side of the level to the right hand side of the level, however there are many enemies in the way. He can use a Shinto stick to transform into a hippopotamus, a monkey, or a tiger, each of which has its own special ability. The hippopotamus is slow and cannot jump very high, but can punch through special destructible blocks in the game world. The monkey can jump higher than the other creatures, and the tiger can run faster. Psycho also has an ally named Birdfly, who can be used as armor or as a boomerang. If Psycho is hit while carrying Birdfly, Birdfly goes away and the player does not lose a life.

In Brazil, Tec Toy released the game as Sapo Xulé: Os Invasores do Brejo (translated as “Xule Frog: Invaders of the Swamp”), which Psycho Fox and his other forms ware replaced by Sapo Xulé (a Brazilian comic frog character), a pig, a turtle and a mouse.

The spiritual sequel to the game was released on the Sega Mega Drive in Japan with a new set of characters and a new setting as Magical Hat Flying Turbo Adventure. The version of the game released in the U.S. and Europe was given a facelift and retitled Decap Attack.