Steam Co-Op Games in Common

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Titan Quest

The Co-Op Experience: Team up for the single player story mode.
This also includes the expansion pack. From the co-creator of Age of Empires, Brian Sullivan, comes an all-new action role-playinggame set in the mythical worlds of ancient Greece, Egypt and China. Amazing visuals and fast-action gameplay deliver a true cinematic gaming experience. Lush ancient world settings crafted in near-photo realistic detail provide the player with an extraordinary canvas on which to set forth on an epic quest of the ultimate good versus evil. With Titan Quest: Immortal Throne, continue the epic story and battle through the sinister underworld of Hades. Along with new foes, players will find new allies. Players will interpret the prophecies of the blind seer Tiresias, fight alongside Agamemnon and Achilles, and use the wiles of Odysseus to conquer this dark new adventure. Streaming, seamless world Over a thousand pieces of unique and legendary equipment Immortal Throne features 10 Additional Character Levels allows players to bring existing and new characters to new heights, along with higher level equipment and skills The expansion pack features an entirely new skill mastery, which combines with existingskill masteries to create eight new exciting character classes Quest through exotic locations in the Mediterranean area and ultimately descend across the river Styx into the heart of Hades. Defeat terrifying new monsters on your way to victory! [AMAZON]

Left 4 Dead

Fight with up to 4 other players against the impending zombie horde. Cover, heal, revive, and protect your teammates.
Full drop in and drop out support including the ability to "pause" your character and let the AI take over.

To enable splitscreen, refer to this forum post.

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.

Saints Row 2

The sandbox just got larger with a totally transformed and expanded city of Stilwater, offering all new locations to explore with new vehicles, including motorcycles, boats, helicopters and planes. Saints Row 2 will be playable online in 2-player co-op through the entire single-player campaign or in the all new open-world competitive multiplayer mode never before seen in the genre.

Beat Hazard

Team up with a friend and groove out/shoot down foes to your favorite tracks. Beat Hazard Ultra DLC is required.


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.

F.E.A.R. 3

Players can take the role of point man, the main character from previous FEAR titles or Fettel, a pscho-kintetic character that can inhabit the bodies of enemies in two player online co-op.In addition the game features two survival style online co-op modes for four players.

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.

Civilization V

Research is shared between players when choosing to play on the same team. If both players research the same item, the time it takes is reduced. When one player discovered a technology, the other gets it as well.Players share the benefits of landmarks, ruins, and other discoveries on the map.Players share the map. Diplomatic options are available as well to trade resources, gold, and units.Co-Op is played in multiplayer with each player picking to join the same "team." It's assumed a balance of 3 players vs 3 AI are chosen, but you can weight it to 3vs1vs1vs1 or 3vs2 or 2vs1, etc.

Frozen Synapse

2 players can tactically strategize and execute plans through the 70 mission campaign and extra challenge mode missions. Hotseat multiplayer is available for local co-op play. 2vAI (i.e. two players playing together against an AI opponent) is available in the Frozen Synapse: Red expansion.


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

Steel Storm: Burning Retribution

Team up through the game's campaign or bonus missions.

The Lord of the Rings: War in the North

Play one of three unique classes in up to 3-player co-op in either split-screen, online, or mixed co-op. Battle through the campaign or a handful of challenge missions (horde-mode style) to level up and gain new skills.

Dead Island

Team up online with four players to survive a zombie infested island. Players can trade items and weapons, drive each other around, revive fallen teammates, and kick the crap out of zombies.

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.

Dungeon Defenders

Team up as one of four characters each with their own unique abilities and traps to conquer dungeons in this tower defense action/RPG hybrid.

Trine 2

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

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.

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.

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

Guardians of Middle-Earth

Team up against the AI in a skirmish mode or custom matches. Player choose class based characters with complimenting abilities from the Lord of the Rings franchise.

Rocket League

You and some friends can team up against the AI in 2v2, 3v3, or 4v4 matches, either online or split screen.

Sven Co-Op

Join online servers or create one for your friends. Co-op Half-Life the way you want it!

Trine 3: The Artifacts of Power

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