Co-Optimus - Steam Co-Op Game Matchmaking *BETA*

Steam Co-Op Games in Common

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Stickwall

	Spec Ops: The Line A series of objective-based cooperative multiplayer scenarios set in Dubai after a series of cataclysmic sandstorms have wrecked the city. It includes four fast-paced missions, each with its own unique objectives, environments and playable characters.
	Trine: Enchanted Edition The players take control of one of the three characters and solve the puzzle together.
	Magicka 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 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.
	Warhammer 40,000: Space Marine The online only survival mode is called Exterminatus, putting a squad of four Space Marines against Orks and other baddies in a violent score based fight to the death. There are three classes to choose from: the Tactical Marine, Devastator or Assault Marine and players will be able to utilize weapons and perks available to those classes from both co-op and multiplayer versus modes.
	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.
	The Darkness II The Vendettas co-op mode is a separate story in which players can choose from four different characters and level them up in 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.
	Awesomenauts 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.
	Castle Crashers The game allows 4 players each to choose a character and embark on a journey to defeat countless hordes of enemies and save the princess.
	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: Complete Story A side-scrolling puzzle-platforming game featuring up to three players working together to complete the campaign. Three player couch co-op, online co-op, and combo co-op (i.e., a mix of couch and online co-op) is supported throughout the campaign. Each player controls one of the three heroes.
	Warframe 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.
	Don't Starve Together Players team up and share resources to survive as long as possible.
	Hammerwatch 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 12 playable characters, randomized levels, and a difficulty level that increases the longer you play
	PAYDAY 2 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.
	Viscera Cleanup Detail: Shadow Warrior You can enlist some friends/coworkers to come and help you clean up (or make even more mess).
	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.
	Project Zomboid Players can team up and survive together in an open world persistent server.
	Starbound 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.
	Zombie Army Trilogy Includes remastered versions of Sniper Elite: Nazi Zombie Army 1, 2, and the unreleased 3. Battle through THREE epic campaigns across 15 demon-infested missions. Play solo or fight back to back in online co-op for 2-4 players.
	Ryse: Son of Rome The cooperative multiplayer experience in "Ryse: Son of Rome" plunges you into the brutal world of gladiatorial combat. You fight across a dozen levels set in the Colosseum with varying objectives. Earn experience and gold, buy booster packs, and customize your gladiator up to level 100.
	Gauntlet 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.
	Brawlhalla Custom play allows up to four players to test their skills against the AI in various modes.
	Stardew Valley Up to three other players can join the host player as farmhands. Farmhands can do almost anything the main player can do. They can farm, mine, fight, fish, forage, marry NPCs and take part in festivals. Each player has their own inventory. When a farmhand is not connected, their inventory can be managed through a chest in their cabin.
	Dying Light Up to 4 players can work together to survive the zombie apocalypse.
	SEGA Genesis Classics Players can team up online or on the couch in those titles that support it
	Titan Quest: Anniversary Edition Up to six players can team up online or via LAN to battle their way through the campaign
	Outland Story co-op and co-op challenge rooms for two online players.
	Warhammer: Vermintide 2 Four player co-op will be supported in the main story campaign missions and side missions. Each player will be able to select from one of five characters and upgrade/outfit their character how they see fit. The combined forces of Chaos and Skaven are merciless, and it will require a co-ordinated team effort to survive their never-ending onslaught.
	Tribes of Midgard Form a tribe, from 1 to 10 players, and thrive together as long as you can.
	Overcooked! 2 Team up with three friends locally, online, or a mix of the two (i.e., combo co-op). Work together through all of the story maps as you prepare dishes and try to get a high score!
	Valheim Whether you want to brave the lands alone or venture with trusted allies, Valheim supports independent, player-hosted servers and unlimited world creation. The developer recommends playing co-op with 3-5 players.
	Arizona Sunshine Join forces with a friend in co-op campaign mode (two player online campaign) or multiplayer Horde mode for up to four players (four player online Horde).
	Lara Croft and the Temple of Osiris Featuring a four-player co-op story, players must work together to explore the temple, defeat hordes of enemies from the Egyptian underworld, solve devious puzzles, and avoid deadly traps.
	Remnant II You can group up with two other players online. There are multiple hero archetypes to choose from, each designed with unique skills and advantages to help the group survive. Loot is shared among all players and every player's world is procedurally generated with different encounters and dungeons to experience.
	Lara Croft and the Guardian of Light Play as Lara or Totec in this isometric view shooter/puzzle hybrid where players must work together to kill enemies and solve environmental puzzles.
	Elden Ring Up to two friends can be summoned. There are three items available to do so. One puts you in a pool to be summoned by anyone, the next allows to be summend by a specific player and the last makes all players visible that are waiting for a co-op partner to the host. You can set a password for your session to make sure no one can disturb your party. Communication ingame happens using emotes. There are restrictions for multiplayer however: You can explore the open world as well as all the dungeons but can't play through the whole story together. Once the area boss is killed, everyone returns to their own session. In addition the horse as well as the fast travel system are not available. And if a friend dies, they are teleported back to their world. If the host dies, everyone is kicked from the session. Progress is also only saved for the host e.g. boss kills will only count for the host.