Independently-developed FPS Shattered Horizon isn't the most high profile action game on the market right now, but it's got two things going for it which we're betting will capture your attention. The first is that until 4 p.m. EST tomorrow, you can download and play the game for free over Steam. It requires DirectX10 and Windows Vista or 7 to play -- but if you've got the tech specs to run the game, you can give it a free trial run until tomorrow afternoon.

Oh, the other thing? It's a first-person shooter that takes place in the zero-gravity environs of the moon. If a cooler premise for a game exists, we've yet to hear it.