Blacklight Retribution is a free-to-play shooter that arrived on the PC earlier this year, and it's now easier than ever to download and play it. The game's been added to Steam, so jump over to the game's page, click Play Game (as long as you have Steam installed first), and you're good to go.
To celebrate, Steam is providing a starter pack for the game for half off. Usually, the items in the pack would cost you $20, but for a limited time you can get two guns, two gun mods, two armor pieces, two equipment gear, a seven-day XP boost, and 3000 GP to spend for $9.99. We'd suggest playing first, of course, before you start spending money on a free-to-play game all willy-nilly.