You are out to get crystals, because there is a crystal crisis going on. The screen doesn't stop moving and neither can you because if it catches up to you, you will die. If you fall off of the buildings, you will die. If you do anything other than jump from platform to platform picking up crystals, you will probably die. Move your character around with WASD. Use the space bar as a way to jump. You can climb up ladders and make big leaps, but the thing you cannot do is fall behind. Keep up with the screen and get all the crystals you can to score big points.