Portal
PuzzlePortal is a first-person puzzle game. Players must solve physical challenges by opening portals to maneuver objects, and themselves, through the enigmatic...
Counter-Strike: Condition Zero advances the #1 online action game series by introducing objective based single-player action, the official CS bot, and special enhancements for online play. CS:CZ is a tactical action game that challenges you to compete with and against cunning computerized opponents in a Tour of Duty across the globe.
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Portal is a first-person puzzle game. Players must solve physical challenges by opening portals to maneuver objects, and themselves, through the enigmatic...
Includes seven new missions featuring the fictional Stetchkov crime family. VoIP capability has been added to multiplayer games, there are seven new missions...
A futuristic game that challenges your agility as well as your aim. Originally a multiplayer mod for Half-Life, now a game on the Steam network for $5.
Team Fortress 2 is the sequel to the game that put class-based, multiplayer team warfare on the map. It delivers new gametypes, a signature art style...
Set in the immediate aftermath of the zombie apocalypse, Left 4 Dead's survival co-op mode lets up to four players blast a path through the swarming zombie...
Enjoy fast-paced multi-player gaming with DeathMatch Classic (aka DMC). Valve's tribute to the work of id software, DMC invites players to grab their...
Day of Defeat offers intense online action gameplay set in Europe during WWII. Assume the role of infantry, sniper or machine-gunner classes, and more...
As Dr. Gordon Freeman, you were last seen exiting City 17 with Alyx Vance as the Citadel erupted amidst a storm of unknown proportions. In Episode Two...
Originally a remake of the Team Fortress modification for Quake. Team Fortress Classic features over nine character classes - from Medic to Spy to Demolition...
Episode One follows scientist Gordon Freeman and his companion Alyx Vance as they fight in humanity's continuing struggle against the transhuman race...
Fast multiplayer action set in the Half-Life 2 universe! HL2's physics adds a new dimension to deathmatch play. Play straight deathmatch or try Combine...
Counter-Strike: Global Offensive (CS: GO) will expand upon the team-based action gameplay that it pioneered when it was launched 12 years ago.