World four hundred is another fast for completion puzzle with one misplaced box.
Step by step solution
Go LEFT, LEFT, UP, UP, LEFT, UP, UP, RIGHT and push DOWN. Go RIGHT and push RIGHT. Go DOWN, push RIGHT and RIGHT. Push UP, go DOWN, LEFT, LEFT, UP, LEFT, LEFT, LEFT, DOWN, DOWN, RIGHT and push UP.
Go LEFT, UP, UP, RIGHT and push RIGHT. Go DOWN, RIGHT, DOWN and push LEFT. Go RIGHT, RIGHT, RIGHT, UP and push LEFT. Go DOWN, LEFT, LEFT, UP, UP, UP, RIGHT, RIGHT and push DOWN.
Push RIGHT, go LEFT, UP, LEFT, LEFT, DOWN, LEFT, LEFT, DOWN, DOWN and push RIGHT. Go LEFT, UP, UP, RIGHT, RIGHT, UP, RIGHT, RIGHT, DOWN and push LEFT.
Go RIGHT, RIGHT, DOWN, DOWN, LEFT and push UP. Go RIGHT, RIGHT, RIGHT, DOWN, push LEFT and LEFT. Go RIGHT, DOWN, DOWN, LEFT, push UP and UP.
Congratulations. You have completed world four hundred. Get ready for world four hundred and one.