World fifty-five is with only six boxes, but very hard.
Step by step solution
Go RIGHT, RIGHT, push UP, UP, go RIGHT, RIGHT, RIGHT, push UP, UP, UP and UP.
Go DOWN, DOWN, DOWN, DOWN, LEFT, LEFT, LEFT, DOWN, DOWN, LEFT, LEFT, UP, UP, push RIGHT, RIGHT, RIGHT, RIGHT, go DOWN, RIGHT, push UP, UP, UP and UP.
Go DOWN, DOWN, DOWN, LEFT, LEFT, LEFT, push UP and UP. Go LEFT, UP, UP, RIGHT and push DOWN. Push RIGHT, go LEFT, push DOWN, DOWN, DOWN, go RIGHT, RIGHT, RIGHT, UP, UP, LEFT and push UP.
Go RIGHT, RIGHT, RIGHT, DOWN, DOWN, RIGHT, DOWN, DOWN, LEFT and push UP. Push LEFT, LEFT, go UP, UP, UP, LEFT, LEFT, LEFT, DOWN, DOWN, DOWN, RIGHT and push RIGHT. Go DOWN, RIGHT, push UP and UP.
Go DOWN, LEFT, LEFT, LEFT, UP, UP, UP, RIGHT, RIGHT, RIGHT, RIGHT, RIGHT, DOWN and push DOWN. Go RIGHT, DOWN, push LEFT, LEFT and LEFT. Go UP, push UP, go LEFT, UP, LEFT, LEFT, DOWN, DOWN, DOWN, RIGHT and push RIGHT. Go DOWN, RIGHT, push UP and UP.
Go DOWN, LEFT, LEFT, LEFT, LEFT, LEFT, DOWN, DOWN, RIGHT, RIGHT, push UP, UP, UP and UP. Go LEFT, UP, push RIGHT and RIGHT.
Congratulations. You have completed world fifty-five. Get ready for world fifty-six.