Wario Land 3: Part 47: Castle of Illusions (Gray Chest)

Turns out Mickey Mouse is not the only character known for traveling through an illusionary castle. For Wario's case, this used to be disguised as a mountain, but then Wario put a Magical Flame into a Lantern to reveal its true form. In this level, there are several doorways you can reach that contain each Chest right there, including the Gray Chest in the first doorway. You just need to make a trek upwards through the castle to find the Gray Key. You will have to keep finding Switch Blocks that create and remove blocks to stand on as platforms, you'll be going back and forth with this to ascend upwards towards where the Gray Key is. Suffice to say, if you accidentally fall back, you'll have to start this course over again. The Gray Key is right at the top-left corner of the big room. Watch out for Zombies in your last stretch towards it. Then just go back into the Gray Chest's room, break through a part of its floor, and then shove the nearby stove downwards and then towards the wall to finally reach the Gray Chest. Castle of Illusions' Gray Chest Treasure is another powerup! The Super Jump Slam Overalls. This powers his Ground Pound back to its full strength, allowing him to shake the earth with his ass! But more so, it lets him drop right through Cracked Purple Blocks, and break Solid Purple Blocks from above! DEATH FROM ABOVE.