World three hundred and seventy-nine is with twelve boxes, three of them already placed.
Step by step solution
Go DOWN, RIGHT, push RIGHT, go UP, RIGHT, push DOWN, DOWN, DOWN, DOWN and DOWN. Go UP, UP, UP, LEFT, UP, LEFT, LEFT, DOWN and push RIGHT. Go DOWN, push DOWN, go LEFT and push UP. Go RIGHT, UP, UP, RIGHT, RIGHT, DOWN, DOWN, DOWN, DOWN, LEFT, DOWN, LEFT, LEFT and push UP. Push RIGHT, go UP, UP, UP, UP, RIGHT, RIGHT, DOWN, push LEFT, go UP, LEFT, push DOWN, DOWN, DOWN, DOWN, go LEFT, DOWN and push RIGHT.
Go UP, UP, UP, LEFT, push DOWN and DOWN. Go RIGHT, UP, UP, push RIGHT, go UP, RIGHT, push DOWN and DOWN. Go UP, LEFT, LEFT, UP, UP, LEFT, push DOWN, DOWN and DOWN. Push LEFT and LEFT. Push UP, go LEFT, LEFT, UP, UP, RIGHT, push RIGHT, RIGHT, RIGHT, RIGHT, RIGHT, go UP, RIGHT, push DOWN, DOWN and DOWN. Go LEFT, LEFT, LEFT, UP, UP, LEFT, LEFT, LEFT, LEFT, DOWN, DOWN, RIGHT, RIGHT and push UP.
Push RIGHT, RIGHT, go UP, RIGHT, push DOWN, DOWN, DOWN and DOWN. Go UP, UP, UP, LEFT, LEFT, LEFT, DOWN, LEFT, LEFT, UP, push RIGHT, RIGHT, RIGHT, RIGHT, go UP, RIGHT, push DOWN, DOWN and DOWN. Go UP, UP, LEFT, LEFT, LEFT, LEFT, UP, push RIGHT, RIGHT, RIGHT and RIGHT.
Go DOWN, RIGHT, RIGHT, UP, UP, LEFT, push DOWN, DOWN, go RIGHT, DOWN, push LEFT, go UP, LEFT and push DOWN. Go LEFT, DOWN, LEFT, LEFT, DOWN, DOWN, LEFT, LEFT, UP, push RIGHT, go DOWN, RIGHT and push UP. Go LEFT and push UP. Push RIGHT and RIGHT. Go LEFT, UP, UP, LEFT, LEFT, DOWN, push RIGHT, go UP, RIGHT, push DOWN, go LEFT, DOWN and push RIGHT.
Congratulations. You have completed world three hundred and seventy-nine. Get ready for world three hundred and eighty.