Sometimes an otherwise-uninteresting looking game has a few tricks up its sleeve. Just about all of Inversion smacks of mediocrity -- its generic storyline (aliens invade Earth!), derivative gameplay (maybe you've played Gears of War?) and unoriginal multiplayer modes (two different kinds of deathmatch!) are all a big turn-off at first glance. But Inversion has one thing going for it: the Gravlink.

It's a device that enables the core mechanic of the game, gravity manipulation. By firing off a red or blue beam, you can increase or decrease the gravity of an area or object. It's one-time use, however you can pick up little energy boosters around the environment that allow you to use it more than once. When I became comfortable with the Gravlink, I found myself having some fun with Inversion.