2,835 Online co-op games your group can play together online, including Terraria, World War III: Black Gold, and PAYDAY™ The Heist.
All games: 24
Mine, build, and take on a changing world with your friends in Terraria. A desktop server starts with 16 online player slots; explore for better gear, then bring it into boss fights and invasions together.
Actual Armies. Actual Weapons. Actual Political Issues.World War III - Black Gold takes the player to the near future. The political crisis has been going on for months, leading to worldwide turmoil. A secret conference of the UN Central Geological Commission reveals that worldwide oil reserves have reached dangerously low levels: Oil...
Take on the role of a hardened career criminal executing intense, dynamic heists in constant pursuit of the next “big score”
Blast through Serious Sam 3: BFE’s campaign with up to 16 online players or four people in local split-screen, against waves of monsters in Egypt.
DC Universe Online is a Free-to-Play, massive multiplayer online action game set in the popular DC Universe. Become one of a new breed of Heroes or Villains and wield incredible powers as you go to war with legendary characters such as Batman, Superman, Lex Luthor and The Joker.
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
Join The Mobile Trench Brigade and protect humanity from the evil Monovision menace!
Every activity in Puzzle Pirates is a uniquely fun puzzle: be it sailing, gunning, or hauling treasure, your own puzzling skill determines your success!
The genre-defining military sim that began as Operation Flashpoint (2001), now a modernized, 64-bit, cross-platform build for Windows and Linux, with its engine released as open source. Over 2 million copies sold. The Cold War battlefield of Everon and Nogova, remastered for today's hardware.
The New Fatal Error DLC includes a new 5-mission Operation and touch-screen controls.
A massively multiplayer grand strategy game, Stronghold Kingdoms is about forging alliances, political mind games, city-building and castle sieges with thousands of other players!
Take on a cryptic cyberpunk campaign with up to three friends, mixing firefights, hacking, psychic powers, and character builds.
Take one of eight heroes into Demigod’s team arenas, play custom matches with friends against bots, or compete for control of the battlefield.
A one-of-a-kind real-time strategy game that allows players to bluff their enemies to lead their nation to victory. The Definitive Edition — includes all DLCs and Steam Deck support.
Kohan: Immortal Sovereigns is the first game in the award-winning real time strategy series. Awarded “RTS Game of the Year” by PC Gamer and Computer Games Magazine, Immortal Sovereigns is a real-time strategy game set in a fantasy world where you take on the role of an immortal known as the Kohan.
Over 20 years of legendary space battles! Explore a massive living universe of danger and opportunity in a challenging and highly rewarding space adventure. Fight, trade, build, and connect with a universe driven and shaped directly by players.
Dive into a world of epic adventure! Create your perfect hero thanks to a uniquely customizable class system. Collect, craft, and customize your gear. Go it alone or group up to challenge dungeons, raids, dynamic open-world content, and your fellow players.
Team up as demon hunters, clear four escalating waves, and fight through grim arenas in The Haunted: Hells Reach.
Three years after the conflict in Chernarus, portrayed in the original Arma 2, a new flashpoint explodes in the Green Sea Region. Coalition forces led by the US Army are deployed to Takistan to quickly restore peace and prevent further civilian casualties.
Fight through infected hordes with up to three friends in Left 4 Dead 2, or face another team in eight-player Versus.
Clear an arcade FPS campaign with up to 16 online players, or use Fusion 2017 for local split-screen with up to four on one display.
Fly custom cooperative maps with friends on the community-run Alti+ Coop server, or take Altitude’s standard modes into competitive aerial matches.
Up to three friends can play online or on one shared screen, combining a wizard's conjured objects, a thief's grappling hook and a knight's strength across 15 fairytale levels.
Command the seas, control the land, forge a new nation, and conquer the globe.