Use the mouse to move your shield around the central circle. Block the squares, but let the plus signs hit the center. If a square gets to the circle, then your combo is broken. This does not mean that the squares stop coming, but a combo is your score. Have fun.
I've had the music as a file for so long, I can't even remember where it came from, but if whoever this song first belonged to is playing this, then credit to you!
