World one hundred and fourty is with four ice boxes and two ordinary boxes.
Step by step solution
Go RIGHT, RIGHT, DOWN, DOWN, DOWN, DOWN, RIGHT, RIGHT and push UP. Go UP, RIGHT, UP and push LEFT. Go LEFT, UP, LEFT and push DOWN. Go DOWN, DOWN, DOWN, LEFT, DOWN and push RIGHT.
Go RIGHT, RIGHT, UP, RIGHT and push UP. Go UP, RIGHT, UP and push LEFT. Go LEFT, LEFT, UP, LEFT and push DOWN. Go DOWN, DOWN, DOWN, LEFT, DOWN and push RIGHT.
Go RIGHT, DOWN, RIGHT, RIGHT, RIGHT, push UP, UP, UP and UP.
Go LEFT, LEFT, LEFT, UP, UP, UP, UP and push RIGHT. Go DOWN, LEFT, DOWN, DOWN, RIGHT, RIGHT and push UP. Go RIGHT, UP, UP and push LEFT. Go RIGHT, DOWN, DOWN, LEFT, DOWN, LEFT, LEFT, UP, UP, RIGHT and push RIGHT.
Go LEFT, LEFT, DOWN, DOWN, RIGHT and push UP. Go RIGHT, UP, UP, push LEFT, LEFT and LEFT.
Go RIGHT, DOWN and push RIGHT.
Congratulations. You have completed world one hundred and fourty. Get ready for world one hundred and fourty-one.