Wario Land 3: Part 51: Sea Turtle Rocks (Green Chest)

Start the stage by Super Ground Pound through the solid purple blocks and enter the doorway. In the next room, the green key and green chest are located, but you must roll through their cracked purple blocks to reach them. Use the slopes at the bottom of the room to help. First roll right to get the green key, then roll left to reach the green chest. The green chest contains the top half of the Sun Medallion, allowing the east side of the world to finally enter daytime, enabling new events such as making the owls sleep in the Colossal Hole, among other things to investigate soon.