There are 2 bars going back and forth, 1 red and 1 blue. Move the green ball with the left and right arrow keys and when you think that the ball will fall through both gaps in both bars press space to drop the ball. This will stop the bars from moving back and forth and the ball will be dropped directly downwards. If it makes it through both you win a point. If any level is too difficult, you can press K to make it easier, just once though. This is a difficulty game, so of course you have lives, and it gets harder as you go.