Wonder Boy in Monster World is set in a peaceful region that has been invaded by an army of monsters, leaving the land in disarray. A young man named Shion is determined to defeat the monsters and restore peace to his home.
The game puts you in control of Shion as he navigates through various challenges and battles against the evil forces of BioMeka. The gameplay is similar to a standard platformer, with actions like running, jumping, and killing enemies. However, it also includes light RPG elements such as talking to townsfolk, collecting money for items, upgrading your life, and equipping different armor and weapons.