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Wonder Boy is a 1986 platformer video game published by Sega and developed by Escape (now known as Westone Bit Entertainment). It was the first in the long-running Wonder Boy series of games and was followed up by five sequels, Wonder Boy in Monster Land, Wonder Boy III: Monster Lair, Wonder Boy III: The Dragon's Trap, Wonder Boy in Monster World and Monster World IV. It was also the basis for the Adventure Island series.