Wonder Boy In Monster World is set in a world where a young man named Shion must defeat an army of monsters that have invaded his land, seeking to make it peaceful again.
The gameplay follows a standard platformer format, with the player controlling Shion as he runs, jumps and kills enemies. The game also features light RPG elements, such as interacting with townsfolk, collecting money to buy items, upgrading his life and equipping armor and weapons. This style is similar to classic games like Zelda, with an emphasis on exploration and combat.