You know this whole social games thing those whippersnappers are talking about is big when Steam gets into the game. The premier PC games distribution platform from Valve, creators of the Left 4 Dead and Half-Life (read: hardcore) franchises, has just signed on five free-to-play games for gamers to enjoy for, well, free! The games include hits like Forsaken World and Champions Online. But most notable of which is Spiral Knights, a brand new casual online role-playing game, or RPG, published by Sega and developed by San Francisco-based Three Rings. Did we mention it's free? Because it totally is.

Spiral Knights is a top-down, hack 'n slash RPG that isn't a far cry from games like The Legend of Zelda. Players assume the role of a Spiral Knight (no way, really?) as they delve deeper into the "Spiral Knights Gold" of an unknown planet named Cradle. Your mission? Find a way home for your people by harvesting new materials to repair their busted spacecraft. You'll do just that through countless ever-changing dungeons presented in a style that harkens back to the good old days of gaming. And you can dungeon crawl with up to four friends at a time, create guilds, and craft your own armor and weapons with what you find Spiral Knights Online Gold.