World four hundred and fifteen is unusual puzzle with six iceboxes, three ordinary boxes and one inert box.
Step by step solution
Go UP, UP, RIGHT, RIGHT, RIGHT, RIGHT, DOWN and push LEFT. Go RIGHT, push DOWN, DOWN and DOWN. Go LEFT, DOWN, LEFT, LEFT, LEFT, LEFT, UP and push RIGHT. Go DOWN, RIGHT, RIGHT, RIGHT, UP, RIGHT, UP, UP, UP, LEFT, UP, LEFT, LEFT, LEFT, DOWN, LEFT, LEFT, UP, push RIGHT, RIGHT, RIGHT, RIGHT and RIGHT.
Go DOWN, RIGHT, RIGHT, UP, UP, LEFT, push DOWN, DOWN, DOWN, DOWN, go RIGHT, DOWN and push LEFT. Go RIGHT, DOWN, DOWN, LEFT, push UP, UP and UP. Go LEFT, push DOWN, go RIGHT, DOWN, push LEFT, LEFT, LEFT and LEFT. Go UP and push UP. Go UP, UP, LEFT, UP and push RIGHT.
Go DOWN, DOWN, DOWN, RIGHT and push DOWN. Go UP, LEFT, UP, UP, UP, RIGHT, RIGHT, RIGHT, DOWN, RIGHT, RIGHT, DOWN, DOWN, DOWN, DOWN, LEFT, LEFT, LEFT and push LEFT. Go UP, UP, LEFT, UP, UP, UP, RIGHT, RIGHT and push DOWN. Go RIGHT and push DOWN.
Go DOWN, RIGHT, push UP, go RIGHT, UP and push LEFT. Go RIGHT, UP, UP, LEFT and push DOWN. Go DOWN, DOWN, LEFT, push UP, go RIGHT, UP, push LEFT, LEFT, LEFT and LEFT. Go RIGHT, RIGHT, RIGHT, RIGHT, RIGHT, DOWN, DOWN, DOWN, DOWN, DOWN, DOWN, LEFT and push UP.
Congratulations. You have completed world four hundred and fifteen. Get ready for world four hundred and sixteen.