There are three doors in each castle, and unlocking a door in one castle will automatically unlock its counterpart on the other.
- There's one door at the Entrance, at the middle part of the big vertical room that connects it with the Skeleton Cave. If the player wants to reach it from the top, they will need both the Crushing Stone and the Griffin's Wing. If they want to reach it from the bottom, only the Crushing Stone is necessary.
- Another door can be found in the Castle Treasury. It is located near the center of the castle, where the final boss battle takes place.
- The last door can also be found in the Castle Treasury, but this one is located near the middle part of the west wing of the stage.
|Item Data: Lure Key|
|Image||Name - Game|
|Type / Users||Attributes / Consume||Statistics / Sell||Found||Notes|
|Opens the door that gives off a golden hue.|| Key|
| Find: Entrance (Castle B)|