Akey appears as an item inKoopa Capers. It is a heavy golden key shaped likeBowser's head. The key falls to the ground surrounded by ninecoins afterLuigi hits the sixth floatingblock in a small room inBowser's Castle, after which Luigi pockets the key and coins. He later reaches a dead end in the side of a secondlava cliff in the Magma Pits, where he squats down to be the same height asWendy O. Koopa and notices a keyhole shaped like Bowser's head that is tucked below an outcrop. If Luigi has the key, he uses it to unlock the door and enters a chamber where he findsBoom-Boom's socks. If Luigi does not have the key, he searches for it until he chooses to wait for someone to open the door. As he sits down to wait, he falls asleep, only to be woken up byKoopa Troopas marching after they open the door. After waiting for them to go by, Luigi goes through the door right before it closes. While he is inside the chamber, sixFire Brothers enter from a door on the other side and start blowingfireballs at him, requiring him to have firepower.

• Keys
• Equipment
• Koopa Capers