World four hundred and thirty-seven is about passing through wall of boxes.
Step by step solution
Go UP and push LEFT. Go RIGHT, DOWN, DOWN and push LEFT. Push UP, go LEFT, push LEFT, LEFT, go UP, UP and push RIGHT. Go LEFT, DOWN, DOWN, DOWN, DOWN and push RIGHT. Push UP. Push RIGHT, go LEFT, LEFT, UP, push RIGHT and RIGHT.
Go LEFT, LEFT, DOWN, LEFT and push LEFT. Go RIGHT, RIGHT, UP, UP, LEFT and push LEFT. Push DOWN, go LEFT, LEFT, DOWN, DOWN, RIGHT, push RIGHT, RIGHT and RIGHT. Go LEFT, LEFT, LEFT, LEFT, UP, UP, RIGHT, RIGHT, push RIGHT, RIGHT and RIGHT.
Go LEFT, LEFT, LEFT, LEFT, LEFT, UP and push RIGHT. Go UP, push RIGHT, RIGHT and RIGHT. Go LEFT, LEFT, LEFT, DOWN, push RIGHT, RIGHT, go UP, RIGHT, push DOWN, go LEFT, DOWN and push RIGHT.
Go LEFT, DOWN, DOWN, LEFT and push UP. Go DOWN, LEFT, LEFT, UP, push RIGHT, RIGHT, RIGHT, RIGHT and RIGHT.
Go LEFT, LEFT, UP, UP, LEFT, push DOWN, go LEFT, DOWN, push RIGHT, RIGHT and RIGHT.
Congratulations. You have completed world four hundred and thirty-seven. Get ready for world four hundred and thirty-eight.