World nineteen is an unusual with ice boxes, rough terrain and hidden slot.
Step by step solution
From the initial position, go UP, push RIGHT, RIGHT, RIGHT and RIGHT.
Go LEFT, UP, UP, LEFT, push DOWN and push LEFT. Go UP, LEFT, UP, UP, RIGHT, RIGHT and push DOWN. Go DOWN, RIGHT, DOWN and push LEFT.
Push DOWN, go LEFT, DOWN, push RIGHT, go UP, UP, UP, UP and push RIGHT.
Go LEFT, push LEFT, go DOWN, LEFT and push UP.
Congratulations. You have completed the nineteenth world. Get ready for the twentieth.