You need to press the arrow keys and try to get up on the lines to get to the door!And when you're trying to jump left or right you need to press the up arrow with it.Do not let your knight's hat touch the black lines. And when you jump make sure that you don't let even one of you legs of the black lines. Then you can play again by pressing the flag!
I would try and get on the last line with the knight! And you can only use this with a computer.