At least 1.2 million people have been enjoying Tribes: Ascend directly from Hi-Rez Studios (including us), but now it's available to Steam's audience of more than 40 million, still for free. Tribes: Ascend is a sci-fi, fast-paced, free-to-play PC shooter featuring jetpacks, skiing and multiple classes. It's almost like the Winter Olympics' biathlon competition, but with more guns and flying.

The game itself is free, but it does have weapons and upgrades for sale, of course. Steam is offering a 50 percent discount on the Starter Pack, which includes a lifetime 50 percent XP boost, two special classes and 12 weapon unlocks, four perk unlocks and 800 Tribes Gold, all for $10 through July 4 at 10 a.m. PT.