In PlusORMinus you rotate a central magnet to attract or repel charged particles. Red particles are positive, and blue are negative. Once the particles hit the circle around your magnet, they stick. Unless, that is, they collide with opposite-charged particles. Then they explode. Your goal is to prevent the outer circle from filling up with stuck particles, either by repelling them off the edges of the screen or detonating them with their counterparts. Detonation is usually preferable, and not just because making things explode looks cool--each busted particle lowers your magnet's charge, and helps fill a meter that gives you a screen-clearing super-attack.

PlusORMinus' vector display-styled imagery, grooving soundtrack, and ramping difficulty give it a sort of Geometry Wars vibe. And though its gameplay is completely different, PlusORMinus is almost as mesmerizing, especially once you realize that, with practice, you can manage an insane amount of on-screen action. It isn't a browser-based game, so it'll take you a few more clicks than usual to get it up and running. You can find the four-megabyte download over at the Experimental Gameplay Project.