The wait is over: Team Fortress 2, the successor to the granddaddy of class-based multiplayer action games, is now playing on Steam. Those who pre-purchase The Orange Box via Steam can access the beta version of one of the most anticipated online action games.

Team Fortress 2 features the most advanced graphics of any Source-based game released to date. Players choose from a range of unique character classes such as medic, spy, sniper, or engineer and must work together to complete a variety of tactical objectives.

The PC edition of The Orange Box - which also features Half-Life 2: Episode Two, Portal, as well as the complete Half-Life 2 experience to date - is now available for pre-purchase via Steam through October 10th for 10% off the $49.95 regular price.