Wonder Boy in Monster Land is an action role-playing platform video game developed by Westone. It was released by Sega for the arcades in 1987 and for the Sega Master System in 1988; Activision released the game for the Amiga, Commodore 64, Amstrad CPC, ZX Spectrum, and Atari ST in 1989. In Japan, the original arcade game was titled Wonder Boy: Monster Land, while the later Sega Mark III home version was titled Super Wonder Boy: Monster World.