Wario Land 3: Part 98: Above the Clouds (Blue Chest)

Description :

Finding the Full Moon Gong in Sea Turtle Rock's Blue Chest was used to summon the full moon of this level, especially if you play it at night. Climb to the highest part of the level and locate a doorway into the moon to the right of the red balloon's doorway; be sure to fall further to the right to pick up the Blue Key before entering. Inside, the moon contains ancient ruins—navigating them carefully and precisely is key to reaching the Blue Chest. The treasure in the Blue Chest is a Pick‑Axe, which can break a larger hole in The East Crater, revealing a portal big enough for Wario to fit through.