World four hundred and ninety-eight has twelve boxes but is not slow to complete.
Step by step solution
Go LEFT, LEFT and push DOWN. Go UP, RIGHT, RIGHT and push DOWN. Push LEFT, go DOWN, DOWN, RIGHT, RIGHT, DOWN, RIGHT, RIGHT, UP, UP, UP, LEFT, push LEFT and LEFT. Push DOWN, go LEFT, DOWN and push RIGHT. Go UP, UP, UP, LEFT and push DOWN. Go UP, LEFT and push UP. Go DOWN, RIGHT, RIGHT and push UP. Push RIGHT, go UP, UP, UP, LEFT, LEFT and push DOWN. Go UP, RIGHT, RIGHT, DOWN, DOWN, DOWN, LEFT, DOWN, LEFT, LEFT and push LEFT. Push UP, go DOWN and push DOWN. Go LEFT, LEFT, UP, push RIGHT and RIGHT.
Go DOWN and push RIGHT. Go LEFT, LEFT, LEFT, DOWN, DOWN, RIGHT, RIGHT, DOWN, DOWN, RIGHT, RIGHT and push UP. Go DOWN, LEFT, LEFT, UP, UP, LEFT, LEFT, UP, UP, RIGHT, RIGHT and push DOWN. Go UP, RIGHT, push RIGHT, go UP, RIGHT and push DOWN. Go LEFT, LEFT, LEFT, UP and push RIGHT. Go DOWN, RIGHT, RIGHT, UP, UP and push LEFT. Go RIGHT, RIGHT, UP, UP, UP, LEFT, LEFT, DOWN and push DOWN. Push RIGHT, go DOWN, DOWN and push LEFT. Go RIGHT, UP, UP, LEFT and push DOWN. Go RIGHT, DOWN, DOWN, LEFT, LEFT, LEFT, UP, UP, push RIGHT and RIGHT.
Go LEFT, LEFT, DOWN, DOWN, RIGHT, RIGHT, RIGHT, UP and push UP. Go LEFT, UP, UP, UP, RIGHT, RIGHT, RIGHT, RIGHT, DOWN, DOWN, DOWN, push LEFT, LEFT, LEFT and LEFT. Go RIGHT, DOWN, DOWN, LEFT and push UP. Push LEFT, go RIGHT, RIGHT, UP, RIGHT, RIGHT, RIGHT, UP, UP, UP, LEFT, LEFT, LEFT, LEFT, DOWN, DOWN and push DOWN. Go RIGHT, DOWN, DOWN, LEFT, LEFT, UP and push LEFT. Go UP, push RIGHT and RIGHT. Go LEFT, LEFT, DOWN, DOWN, LEFT, LEFT, UP and push RIGHT. Go DOWN, RIGHT, RIGHT, UP, UP, RIGHT, UP, UP, UP, RIGHT, RIGHT, RIGHT, RIGHT, DOWN, DOWN, DOWN, LEFT, LEFT and push LEFT.
Go DOWN and push LEFT. Go RIGHT, UP, RIGHT, RIGHT, RIGHT, UP, UP, UP, LEFT, LEFT, LEFT, LEFT, DOWN, DOWN and push DOWN. Go RIGHT, RIGHT and push UP. Push LEFT, go DOWN, RIGHT, RIGHT, RIGHT, UP, UP, UP, LEFT, LEFT and push DOWN. Go UP, RIGHT, RIGHT, DOWN, DOWN, DOWN, LEFT, LEFT, LEFT, DOWN, DOWN, LEFT, LEFT and push UP. Push LEFT, go UP, push RIGHT, RIGHT, go LEFT, LEFT, DOWN, DOWN, LEFT, LEFT, UP and push RIGHT.
Go DOWN, RIGHT, RIGHT, RIGHT, RIGHT and push UP, UP.
Congratulations. You have completed world four hundred and ninety-eight. Get ready for world four hundred and ninety-nine.