You have two circles, a red and a green one. Hit the block with the same color as one of your circle to gain points, but don't touch a different colored one. Don't touch any black blocks with any of the circles.
- Movement: Arrows or WASD
- Speed up circling: SPACE
- Mute/Unmute M to mute, U to unmute
Play the colorblind version here: http://svejkgames.com/game/red-and-green/colorblind/
(Also if you take a screenshot anytime you get an expensive modern art.)