Stage 54

Drop down that gap on your right, and destroy the boxes in which the fire are on. Remember to box and to prevent the joker to attack you, than box on the left and grab the key.

Hit the fire with your hammer and it will be minimized. Jump over to the right and box all the way up, just make sure you know the pattern the psirollers are flying in, so that you can go all the way up without any hindrance than exit the stage by going back to the starting point and dropping from the left. ^_^