From the start position - go UP. Then push RIGHT, go UP and push RIGHT again.
Now go UP, RIGHT and RIGHT, then push DOWN, DOWN and go UP, UP, LEFT, LEFT and DOWN
Push RIGHT, then DOWN, go RIGHT and push UP.
Go LEFT, LEFT, LEFT, DOWN, LEFT, LEFT and UP. Push the box
RIGHT, RIGHT, RIGHT, RIGHT.
The last box is easily placed by going LEFT, LEFT, DOWN and pushing RIGHT and RIGHT.
Congratulations. You have completed the eleventh world. Get ready for the twelfth.