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- "From this point onward, the territory is part of the great dragon's monster castle. Anyone who values his life better leave here immediately."
- —Sign in the castle's entrance
The Labyrinth of No End is the final round from the game, a large labyrinth that ends with a battle against the powerful dragon.
The Last Dungeon is the first area from the game, a reduced version of the previous game's last round. After defeating Meka Dragon, Book is transformed into a Lizard-Man and the castle starts collapsing. In a hurry to escape, Book drops his legendary equipment in the way.
A section of the castle, named Cyber Dungeon in the game's achievements, appears as a secret area. It is a reproduction of the cybernetic area from the castle in Wonder Boy III: The Dragon's Trap, including a boss battle against Meka Dragon. Jin gains a heart after defeating Meka Dragon.