From the initial position, go DOWN, DOWN, DOWN, LEFT and push UP. Go LEFT, push LEFT, go UP, LEFT and LEFT. Push DOWN, DOWN and DOWN.
Go UP, UP, UP, RIGHT, RIGHT, DOWN, RIGHT, RIGHT, DOWN, DOWN, DOWN, LEFT, LEFT, UP and push LEFT. Go DOWN, push LEFT, LEFT, go RIGHT, RIGHT, RIGHT, RIGHT, RIGHT, UP, UP, UP, LEFT, LEFT, UP, LEFT, LEFT, push DOWN, DOWN, DOWN, go RIGHT, DOWN and push LEFT.
Go UP, UP, UP, UP, RIGHT, RIGHT, DOWN, push LEFT, DOWN, DOWN, go LEFT, DOWN and push RIGHT. Go UP, UP, UP, UP, LEFT, push DOWN, DOWN and DOWN.
Go UP, UP, RIGHT, RIGHT, RIGHT, RIGHT, RIGHT, UP, UP and LEFT. Push DOWN, go RIGHT, DOWN, push LEFT, LEFT and LEFT. Go UP, LEFT, push DOWN, DOWN and DOWN.
Congratulations. You have completed world twenty-one. Get ready for world twenty-two.
For this world, the solution for Shove It! - Room 7 works as well.