Steam Co-Op Games in Common

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Four player co-op is available in all game modes and types including a story mode and an unlockable survival mode. While you can't drop in to a game, you can drop out and not break the session if you aren't the host.

Portal 2

Portal 2 will have a co-op campaign. Players take control of a robot and work through puzzles that require two players to work together to solve.


Terraria is a world building open ended side scrolling action game. Think of it like Minecraft in 2D.

E.Y.E: Divine Cybermancy

Play throught he campaign with up to four players.

Saints Row: The Third

The entire Saints Row: The Third experience can be enjoyed by two players through online play or system link. The game requires an online pass for co-op play.

Serious Sam HD: The First Encounter

The Classic Serious Sam game is back with updated visuals for the PC on a brand new engine. Team up in this no holds barred shooter.

Serious Sam HD: The Second Encounter

Co-Op is available through the game's story mode as well as in a brand new survival co-op mode.

Orcs Must Die! 2

Play as the Sorceresses or War Mage through the game's levels in two player co-op.


Three players can team up locally or online and play against bots.

Rocketbirds: Hardboiled Chicken

Select a pair from the dirty half-dozen Budgie commando characters and set out on a mission to save the daughter of a general in 10 co-op missions.

Company of Heroes: Tales of Valor

Operation Stonewall is the lone co-op mode in Tales of Valor. It throws up to four players into a scenario where they defend a town against an all out attack by an overwhelming AI opponent. You'll have to use everything at your disposal to try and hold out.

Red Faction: Armageddon

Infestation is an online co-op swarm mode. 4 players can join together to take on increasingly difficult waves of enemies.

Monaco: What's Yours is Mine

Team up with up to four people on the same screen or online to steal everything that isn't nailed down

Trine 2

A side-scrolling puzzle-platforming game featuring up to three players working together to complete the campaign.


Team up in a PvE experience with friends.

Path of Exile

Form a party of up to 6 players online to adventure through randomly generated areas. Players can join the party at any time and port into a private area that their party has already created. Choose from six classes in this highly character-customizable ARPG.


Solo or cooperate in this adventure from bottom to top of Castle Hammerwatch. Kill hordes of enemies with varied looks and features through four unique enviroments with traps, hidden secrets and puzzles.

Risk of Rain

Team up with 4 friends to fight your way off an alien planet with up to 10 playable characters, randomized levels, and a difficulty level that increases the longer you play


Up to 4 players take perform multiple bank heists and robberies spanning over 30 missions. Gameplay is heavily improved and expanded since it's prequel, with a number of new abilities and items.

7 Days to Die

7 Days to Die supports up to eight players on a server. Players can setup their own private servers for a multiplayer session and set options like friendly fire and difficulty

Borderlands 2

Players work together using four different classes of characters to complete quests, gather loot, and trade items. All three systems support online co-op. Local co-op is available on the console versions.

Borderlands: The Pre-Sequel

Players work together using four different classes of characters to complete quests, gather loot, and trade items. All three systems support online co-op. Local co-op is available on the console versions.


Join up with friends to create and build in this open-ended game of creation and exploration.

Dungeon of the Endless

A four player roguelike with tower defense elements. Explore your way through randomly generated rooms and mount defenses against hostile aliens in a pixelated top-down action RPG.

Left 4 Dead 2

Take the role of a different set of survivors as you use all new blunt force weapons, chainsaws and new guns in the sequel to Left 4 Dead. Teamwork is even more crucial as high intensity moments require greater communication to survive.To enable split screen refer to this post.

BattleBlock Theater

BattleBlock Theater features a co-op campaign for two online or local players. Four local players can play nine different Arena modes against bots.


Each character plays wildly different this time as players team up in this dungeon crawler!

PAYDAY: The Heist

Four player online or LAN play with drop in/drop out support.

Titan Quest

Up to six players can team up online or via LAN to battle their way through the campaign


Story co-op and co-op challenge rooms for two online players.