Online Co-Op

The most-anticipated game of the year and the sequel to the best-selling first-person action game of all time, Modern Warfare 2 continues the gripping and heart-racing action as players face off against a new threat dedicated to bringing the world to the brink of collapse.

Sven Co-op is a co-operative game originally based around Valve Software's Half-Life. In this game players must work together against computer controlled enemies and solve puzzles as a team.

Keep Her Safe is a survival shooting game. Gather resources, fortify your base, and withstand zombie hordes to keep the rocket project alive and bring an end to the acid rain apocalypse. Besides the hard life in wasteland, you can also chill up with friends in different multiplayer gameplays.

Demolish your friends with hundreds of upgradable weapons shot from your customizable tank in this action-packed online multiplayer tanks game. Earn XP to level up and unlock new tanks, weapons, and gear. Fight against or alongside your friends for strategic team or free-for-all matches.

Take on the role of a modern farmer in Farming Simulator 17! Explore farming possibilities in a new North American environment. Drive over 250 farming vehicles and equipment from over 75 manufacturers, including new brands such as Challenger, Fendt, Valtra or Massey Ferguson.

Build, quest, and conquer across an infinite procedurally generated world. Play alone or with friends as you establish a settlement and explore deep dungeons, fight monsters and bosses, mine rare ores, craft magical equipment, recruit specialists for your colony, and more!

Risk of Rain is an action platformer with roguelike elements. With permanent death as a primary feature, players will have to play their best to get as far as possible. Fight on a mysterious planet with randomly spawning enemies and bosses, either alone or with 3 friends in online co-op.

Spelunky 2 builds upon the unique, randomized challenges that made the original a roguelike classic, offering a huge adventure designed to satisfy players old and new. Meet the next generation of explorers as they find themselves on the Moon, searching for treasure and missing family.

Unsung Warriors is a 2D action-adventure game set in Iron Age inspired Europe. Fight your way past enemies and traps, while exploring the secrets of an ancient crypt.

Unrailed! is a co-op multiplayer game where you have to work together with your friends to build a train track across endless procedurally generated worlds. Master random encounters with its inhabitants, upgrade your train and keep it from derailing!

At last, the Dungeon Lord has successfully united the forces of evil and established his dark empire. Time for the next step in his most diabolical quest: expansion!

Create a hero from one of four classes to save Etheria in this 4-player coop Tower Defense Action-RPG. Includes Steam exclusive Portal gun & TF2 familiars!