Starting right now, you can download Unreal Tournament 3 from Steam and play it for the low low cost of free. The offer is good through this weekend, at which point they're hoping you dug it enough that you'll pony up $20 to keep playing.

Unreal Tournament 3 is actually a very good game, with full support for bots, flexible gameplay modes, familiar weapons, tons of gorgeous maps, and skateboarding. That's right, skateboarding. If you don't feel like walking, you can press a button and hop onto a hoverboard like the one in Back to the Future. However, the main draw is that Unreal Tournament 3 is still the only shooter to have a five-story tall alien tripod as a driveable vehicle.