Wario Land 3 - Castle of Illusions (Gray Chest)

Enter the door and hit the switch. Go back out and you’ll see a platform lunging forward. Scale the platforms and climb the ladder to enter the next room with a switch. Throw a parasol guy at the wall to shatter it then hit the switch to alter the platforms. Cross to the next door and hit a switch there. Scale more of the platforms then enter another room with a switch. Go left and retrieve the Gray Key. Descend to where you first started and enter the room with a stove. Open a hole in the floor and push the stove there. Jump off the stove then open the Gray Chest. The chest contains Steel Overalls. This suit allows you to stun enemies while ground pounding and even shatter blocks while falling hard.