Board Thread:Off-Topic Activities/@comment-27121914-20190326083328/@comment-26822753-20190626153630

I pick him up, assemble him into a horizontal rocket launcher shape, then enter the next room holding the newly-made Waluigi Launcher.

Floor 20 is 75m tall, disables all your gear for the floor, is made of red girders, and has Donkey Kong guarding the exit at the top, with ladders, barrels, and fire for him to throw at you.