If you need an ultimate test of skill then this is most certainly the game for you. The screen moves in a constant circle. You have two roles. The first if to use the space bar to continuously reverse gravity to avoid danger such as walls and gold lava. Also, in levels to come you will have to change your color using the left ctrl button. This is because you can only enter strobes of light by being the same color as that strobe. This game is definitely hard on the eyes and will surely test your skill and endurance.