Prospective beta testers need only sign up for a free InstantAction account in order to get in on the action.

As in Tribes, Fallen Empire's major draw is its jetpack-based flight, which makes for a rather frenetic first-person shooter. The game supports up to 16 players on two maps, played in either deathmatch or capture-the-flag modes.

For more on the game, check out our recent preview.