While the "Wonder Boy" series adopted an action RPG system for its sequels (beginning with "Wonder Boy in Monster Land"), most of the "Adventure Island" sequels stuck to the game system of the original "Wonder Boy". Moreover, Hudson Soft also obtained the rights to port all of the "Wonder Boy" sequels to the TurboGrafx-16, changing the title and character designs of each game (with the exception of '). Incidentally, the Japanese version of "Dragon's Curse" (the TurboGrafx-16 adaptation of ') was titled "Adventure Island".