World four hundred and ninteen is with placement of the boxes at the center of the puzzle.
Step by step solution
Go LEFT, DOWN, DOWN, LEFT, DOWN, DOWN, DOWN, DOWN, RIGHT, RIGHT, RIGHT and push UP. Go RIGHT, UP, UP and push LEFT. Go RIGHT, DOWN and push LEFT. Go DOWN, DOWN, LEFT, LEFT, LEFT, UP, UP, UP, UP, RIGHT, UP, UP, RIGHT, RIGHT, DOWN, RIGHT, push DOWN and DOWN. Go RIGHT, RIGHT, RIGHT, DOWN, DOWN, LEFT, push LEFT and LEFT. Go RIGHT, RIGHT, RIGHT, UP, UP, LEFT, LEFT, LEFT, UP, UP, LEFT, UP, LEFT, LEFT, DOWN, DOWN, LEFT, DOWN, DOWN, DOWN, DOWN, RIGHT, RIGHT, RIGHT, push UP and UP.
Go DOWN, DOWN, LEFT, LEFT, LEFT, UP, UP, RIGHT and push RIGHT. Go LEFT, LEFT, UP, UP, RIGHT, push DOWN, go LEFT, DOWN and push RIGHT. Go UP, UP, UP, UP, RIGHT, RIGHT, DOWN, push LEFT, go UP, LEFT, push DOWN, DOWN and DOWN. Go UP, LEFT, LEFT, LEFT, DOWN, LEFT, LEFT, UP, push RIGHT, RIGHT, RIGHT and RIGHT. Go DOWN, DOWN, DOWN, DOWN, RIGHT, RIGHT, RIGHT, UP, RIGHT, RIGHT, RIGHT, RIGHT, UP, UP, LEFT, LEFT, LEFT, UP, UP, LEFT, LEFT, LEFT and push DOWN.
Go LEFT, DOWN, DOWN, DOWN, LEFT, LEFT, LEFT and push UP. Go DOWN, RIGHT, RIGHT, RIGHT, UP, UP, UP, LEFT, LEFT, DOWN, push DOWN, go LEFT, DOWN, push RIGHT and RIGHT. Go LEFT, UP, UP, UP, RIGHT, RIGHT, RIGHT, UP, RIGHT, RIGHT, RIGHT, DOWN, DOWN, RIGHT, RIGHT, RIGHT, DOWN, DOWN, LEFT, LEFT, LEFT, LEFT, DOWN, LEFT, LEFT, LEFT, push UP and UP. Go DOWN, LEFT, LEFT, UP, UP, UP, LEFT, LEFT, DOWN and push RIGHT.
Go UP, RIGHT, push DOWN, DOWN, go LEFT, DOWN, push RIGHT and RIGHT. Go LEFT, UP, UP, UP, RIGHT, RIGHT, RIGHT, UP, RIGHT, RIGHT, RIGHT, DOWN, DOWN, RIGHT, RIGHT, RIGHT, DOWN, DOWN, LEFT, LEFT, LEFT, LEFT, DOWN, LEFT, LEFT, LEFT and push UP. Go DOWN, RIGHT, RIGHT, RIGHT, UP, RIGHT, RIGHT, RIGHT, push UP, go RIGHT, UP, push LEFT and LEFT.
Congratulations. You have completed world four hundred and ninteen. Get ready for world four hundred and twenty.