Duet is a rhythm-based arcade game that places you in control of two small orbs. One orb is red and the other blue, but the color isn't as important as their position. Orbs are connected and exactly opposite each other on a small ring at the bottom of the screen. The ring can spin clockwise or counter-clockwise by pressing on the right and left sides of the screen, respectively. The ring will rotate for as long as you hold, and stop on release. The Game-Play is to spin the ring around in such a way that the orbs don't run into any of the blocks falling.