World four hundred and ninety-nine starts with surrounded by the letter D-alike formation of boxes.
Step by step solution
Push RIGHT, go DOWN, DOWN, DOWN, DOWN, LEFT, LEFT, LEFT, UP, UP, push UP and UP. Go DOWN, DOWN, DOWN, DOWN, RIGHT, RIGHT, RIGHT, UP, UP, UP, RIGHT, RIGHT, UP, UP, UP, LEFT, LEFT and push DOWN. Go UP, RIGHT, RIGHT, DOWN, DOWN, DOWN, LEFT, LEFT, DOWN, DOWN, DOWN, LEFT, LEFT, LEFT, UP, UP, UP, UP and push UP. Push RIGHT, go LEFT, DOWN, DOWN, DOWN, DOWN, DOWN, RIGHT, RIGHT, RIGHT, UP, UP, UP, RIGHT, RIGHT, UP, UP, UP, UP, UP, LEFT, LEFT, LEFT, LEFT, DOWN and push DOWN.
Push RIGHT and RIGHT. Go LEFT, LEFT, UP, UP, RIGHT, RIGHT, RIGHT, RIGHT, DOWN, DOWN, DOWN, DOWN, DOWN, LEFT, LEFT and push UP. Go LEFT and push LEFT. Go RIGHT, RIGHT, DOWN, RIGHT, RIGHT, UP, UP, UP, UP, UP, LEFT, LEFT, LEFT, LEFT, DOWN, DOWN, RIGHT, RIGHT and push DOWN. Go UP, LEFT, LEFT, UP, UP, RIGHT, RIGHT, RIGHT, RIGHT, DOWN, DOWN, DOWN, DOWN, DOWN, LEFT, LEFT, DOWN, LEFT and push UP.
Go RIGHT, RIGHT, RIGHT, UP, UP, UP, UP, UP, LEFT, LEFT, LEFT, LEFT, DOWN, DOWN, RIGHT, RIGHT and push RIGHT. Go LEFT, LEFT, LEFT, UP, UP, RIGHT, RIGHT, RIGHT, RIGHT, DOWN and push DOWN. Go LEFT, LEFT, LEFT, LEFT and push DOWN. Go LEFT, LEFT, UP, push RIGHT, RIGHT, RIGHT, RIGHT and RIGHT. Go LEFT, DOWN and push LEFT. Go UP, LEFT, LEFT, DOWN, push DOWN, DOWN and DOWN.
Go UP, push RIGHT, RIGHT and RIGHT. Go DOWN, DOWN, DOWN, LEFT, LEFT, LEFT, push UP, UP, UP, UP and UP. Push RIGHT, go UP, RIGHT, RIGHT, DOWN and push LEFT. Go RIGHT, push DOWN and DOWN. Go UP and push RIGHT. Go LEFT, DOWN, LEFT, LEFT, LEFT, UP, UP, LEFT, UP and push RIGHT. Go DOWN, DOWN, DOWN, RIGHT, RIGHT, RIGHT, UP, UP, LEFT and push DOWN.
Congratulations. You have completed world four hundred and ninety-nine. Get ready for world five hundred.