World thirty-one looks very easy, but it is not easy at all.
Step by step solution
Go UP, UP, LEFT, UP, UP, LEFT and push DOWN. Go RIGHT, UP, RIGHT, RIGHT and push DOWN. Push LEFT, go DOWN, DOWN, DOWN, LEFT and push UP. Go RIGHT, UP, UP, UP, LEFT, LEFT, DOWN, LEFT, DOWN and DOWN. Push RIGHT, RIGHT, go DOWN, RIGHT and push UP.
Go LEFT, LEFT, LEFT, UP, UP, RIGHT, UP, RIGHT, RIGHT, RIGHT, DOWN, RIGHT, DOWN, DOWN, push LEFT, LEFT, UP and RIGHT. Go UP, UP, LEFT, push DOWN, go UP, LEFT, LEFT, DOWN, push RIGHT, go UP, RIGHT, RIGHT, DOWN, DOWN, DOWN and LEFT. Push LEFT and UP.
Go DOWN, RIGHT, RIGHT, UP and push LEFT. Go RIGHT, UP, UP, LEFT and push DOWN. Go UP, LEFT, LEFT, DOWN and push RIGHT. Go UP, RIGHT, RIGHT, DOWN, DOWN, DOWN, LEFT and LEFT. Push UP, go DOWN, RIGHT, RIGHT, UP, UP, UP, LEFT, LEFT, LEFT, DOWN, LEFT, DOWN and DOWN. Push RIGHT, RIGHT, go UP and push LEFT. Go UP, UP, RIGHT, RIGHT, RIGHT, DOWN and DOWN.
Push LEFT, LEFT, go DOWN, DOWN, RIGHT and push UP. Go RIGHT, UP, UP, UP, LEFT, LEFT and push DOWN. Push RIGHT, go UP, RIGHT and push DOWN.
Congratulations. You have completed world thirty-one. Get ready for world thirty-two.