World three hundred and seventy-eight is very fast for completion.
Step by step solution
Go LEFT, push UP and UP. Go LEFT, LEFT, LEFT, LEFT, UP, UP, push RIGHT and RIGHT. Go DOWN, DOWN, RIGHT, RIGHT, DOWN, DOWN, RIGHT, RIGHT, UP, UP, UP, UP and push LEFT.
Go RIGHT, DOWN, DOWN, push LEFT, LEFT, LEFT and LEFT. Go UP, UP, LEFT, LEFT, UP, UP, RIGHT, RIGHT and push DOWN. Go UP, LEFT, LEFT, DOWN, DOWN, DOWN, push RIGHT and RIGHT.
Go LEFT, UP, LEFT, UP, UP, RIGHT, push DOWN, DOWN, go LEFT, DOWN and push RIGHT. Go LEFT, DOWN, push RIGHT, RIGHT, RIGHT and RIGHT. Go DOWN, DOWN, RIGHT, RIGHT, UP, UP, push LEFT, LEFT and LEFT.
Go RIGHT, RIGHT, RIGHT, DOWN, push LEFT, go DOWN, LEFT, push UP, go RIGHT, UP and push LEFT. Go RIGHT, RIGHT, UP, UP, LEFT, push DOWN, go RIGHT, DOWN and push LEFT.
Congratulations. You have completed world three hundred and seventy-eight. Get ready for world three hundred and seventy-nine.