Wonder Boy

Originally Wonder Boy was going to have non-stop moving as a pressure element, but the designer Ryuichi Nishizawa who could not play the game like that, had that element removed.[3] The first Wonder Boy game is a side-scrolling platformer in which the player must reach the end of the level, avoiding enemies and collecting fruit to restore a gradually reducing time meter. Aside from Wonder Boy III: Monster Lair, which features similar gameplay to Wonder Boy while also incorporating shoot 'em up gameplay, the other games in the series, referred to in Japan as the Monster World sub-series, focus on a fantasy setting with role-playing elements. Defeating enemies in these games earns money that can be used to purchase new weapons, armor, and items to make the player stronger. Many of these games have a Metroidvania approach to gameplay, in which obtaining new items or abilities can grant access to new areas in the game.[4]

Westone, the developer of the series, owned the copyrights to each game in the series, while Sega retained the "Wonder Boy" and "Monster World" trademarks. This created a situation which allowed other game companies to publish ports of the games to non-Sega platforms under license from Westone, provided that they changed the titles to remove all references to "Wonder Boy" or "Monster World".

With the exception of Monster World IV, each game in Wonder Boy series has been ported to other systems by Hudson Soft. The original game was ported to the Nintendo Entertainment System under the name Adventure Island, which eventually spawned its own franchise. Wonder Boy in Monster Land, Wonder Boy III: The Dragon's Trap, and Wonder Boy in Monster World, were all released on the TurboGrafx-16/PC Engine under the names Bikkuriman World, Dragon's Curse, and The Dynastic Hero respectively. Wonder Boy III: Monster Lair was ported to the TurboGrafx-CD with original main and boss characters, although the North American version removed the "Wonder Boy III" part in the title while the Japanese version kept it. Another port of Wonder Boy in Monster Land, titled Saiyūki World, was developed by NMK and published by Jaleco for the Nintendo Famicom in Japan, also spawning an independently created sequel, Saiyūki World 2, which was released in North America as Whomp 'Em.

In Brazil, where the Master System received much popularity, Tec Toy released adapted versions of Wonder Boy in Monster Land, Wonder Boy III: The Dragon's Trap, and Wonder Boy in Monster World under the names Mônica: No Castelo do Dragão (Monica: The Dragon's Castle), Turma da Mônica em O Resgate (Monica's Gang to the Rescue), and Turma da Mônica na Terra dos Monstros (Monica's Gang in the Land of Monsters). These games replaced the main characters with characters from Mauricio de Sousa's Monica's Gang comic book series.[15] The latter, Turma da Mônica na Terra dos Monstros, received a re-release with SD card update compatibility in August 2017.[16][17]

• Official Monster World Complete Collection website from Sega (in Japanese)
• Westone Bit Entertainment (developers of the series) (in Japanese)