World sixty-four is with small amount of boxes, but need some clever tactics.
Step by step solution
Go LEFT, UP, UP and push UP. Go RIGHT, UP, push LEFT and LEFT.
Go RIGHT, DOWN, DOWN, DOWN, DOWN, RIGHT, RIGHT, UP and push LEFT. Go DOWN, LEFT, push UP, UP and UP.
Go DOWN, DOWN, RIGHT, RIGHT, DOWN, RIGHT, RIGHT, UP, push LEFT and LEFT. Go DOWN, LEFT, LEFT, UP, UP, UP, RIGHT, UP, RIGHT, RIGHT, DOWN and push DOWN. Go LEFT, DOWN, DOWN, LEFT, LEFT, UP, UP, UP, LEFT, LEFT, DOWN and push RIGHT. Go UP, RIGHT, RIGHT, UP, RIGHT, RIGHT, DOWN, DOWN, LEFT, DOWN, DOWN, LEFT, LEFT, UP and push UP. Go LEFT, UP, UP, push RIGHT and RIGHT. Go LEFT, LEFT, DOWN, DOWN, RIGHT, push UP, go LEFT, UP and push RIGHT.
Go DOWN, DOWN, DOWN, DOWN, LEFT, push UP, UP and UP. Go DOWN, DOWN, DOWN, RIGHT, RIGHT, RIGHT, UP, push LEFT, go DOWN, LEFT, push UP, UP and UP.
Go DOWN, DOWN, RIGHT, RIGHT, DOWN, RIGHT, push UP, UP and UP.
Congratulations. You have completed world sixty-four. Get ready for world sixty-five.