World five hundred and two has only one misplaced box, but several other already placed boxes.
Step by step solution
Go UP and push UP. Go LEFT, LEFT, UP, UP and push RIGHT. Push DOWN, go LEFT, DOWN, DOWN and push RIGHT. Go DOWN, RIGHT, RIGHT, UP, RIGHT, UP and push LEFT. Go UP, UP and push LEFT. Go RIGHT, DOWN, DOWN, DOWN, DOWN, LEFT, LEFT, UP, LEFT, UP, UP, RIGHT, push RIGHT, go UP, RIGHT, push DOWN and DOWN. Go UP, LEFT, LEFT, LEFT, UP and push RIGHT. Go LEFT, DOWN, DOWN, DOWN, RIGHT, DOWN, RIGHT, RIGHT, push UP, go RIGHT, UP, RIGHT, UP, push LEFT and LEFT. Go UP and push LEFT. Go RIGHT, DOWN, RIGHT, DOWN, DOWN, LEFT, DOWN, LEFT, LEFT, UP, LEFT, UP, UP, RIGHT and push RIGHT.
Go UP, RIGHT, UP, RIGHT, push DOWN and DOWN. Go UP, LEFT, LEFT, DOWN, LEFT, LEFT, UP and push RIGHT. Go LEFT, DOWN, DOWN, DOWN, RIGHT and push UP. Go DOWN, DOWN, RIGHT, RIGHT, UP and push LEFT. Push UP, go LEFT, LEFT, UP, UP, RIGHT and push DOWN. Go LEFT, DOWN, DOWN and push RIGHT. Go DOWN, RIGHT, RIGHT, UP, RIGHT and push UP. Push LEFT, go DOWN, DOWN, LEFT, LEFT, UP, LEFT, UP, UP, RIGHT, UP, push RIGHT and RIGHT. Push DOWN, DOWN, go UP, UP, LEFT, LEFT, LEFT, DOWN, DOWN, DOWN, RIGHT and push UP. Go LEFT, UP, UP, RIGHT, RIGHT, RIGHT, DOWN, DOWN and push LEFT.
Go RIGHT, UP, UP, LEFT, LEFT, LEFT, DOWN, DOWN, DOWN, RIGHT, DOWN, RIGHT, RIGHT and push UP. Go RIGHT, UP, RIGHT, UP and push LEFT. Go DOWN, DOWN, LEFT, DOWN, LEFT, LEFT, UP, LEFT, UP, UP, UP, RIGHT, RIGHT, RIGHT, UP, RIGHT, push DOWN and DOWN. Go UP, LEFT, LEFT, LEFT, UP and push RIGHT. Push UP, go DOWN, DOWN and push DOWN. Go UP, LEFT, LEFT, DOWN, DOWN, DOWN, RIGHT, DOWN, RIGHT, RIGHT, UP, RIGHT and push UP. Go DOWN, LEFT, DOWN, LEFT, LEFT, UP, LEFT, UP, UP, UP, RIGHT, RIGHT, RIGHT, RIGHT, UP and push LEFT. Go DOWN, LEFT, LEFT, LEFT, DOWN, DOWN, DOWN, RIGHT, DOWN, RIGHT, RIGHT, UP, RIGHT, UP and push UP.
Go DOWN, DOWN, LEFT, DOWN, LEFT, LEFT, UP, LEFT, UP, UP, UP, RIGHT, RIGHT, DOWN and push RIGHT.
Go LEFT, UP, LEFT, LEFT, DOWN, push RIGHT and RIGHT. Go LEFT, LEFT, DOWN, DOWN, RIGHT, push UP and UP. Go DOWN, DOWN, DOWN, RIGHT, RIGHT, UP, push LEFT, go DOWN, LEFT and push UP. Go LEFT, UP, UP, RIGHT, RIGHT and push DOWN. Go UP, LEFT, LEFT, DOWN, DOWN, RIGHT, DOWN, RIGHT, RIGHT, UP, RIGHT, UP and push LEFT. Go DOWN, DOWN, LEFT, LEFT, UP, LEFT, UP, UP, RIGHT, RIGHT, UP, RIGHT and push DOWN.
Go LEFT, LEFT, LEFT, DOWN, DOWN, RIGHT and push UP.
Go DOWN, DOWN, RIGHT, RIGHT, UP and push LEFT.
Congratulations. You have completed world five hundred and two. Get ready for world five hundred and three.