Best Co-op Games on Steam
Unlike generic lists, our strategy game recommendations use a rigorous analysis of Steam user reviews to identify and feature only the best, community-validated co-op games. For those who prefer not to search, lists of the most played, top deals and best free co-op games are available at the bottom of the page.
Filters & Lists
Hellbreach: Vegas
Hellbreach: Vegas is a Wave-based First-Person Shooter for 1-4 players, made with passion by a one man dev team! Set your loadout, kill, and earn cash. Take a spin on the various slot machines and level up to improve your survival chances. Are you ready to try your luck?
KIBORG: Arena
Fight for cash and glory in a prison planet’s Coliseum in this free prologue to KIBORG, the fast-paced action rogue-lite with brutal, cybernetic-enhanced combat.
Retail Company Simulator
Run your retail company. Sign contracts with leading brands, order products, hire workers, expand your store, and never let your customers leave the store empty-handed. Play with friends or go solo, and enjoy the growth of your shop.
Together in Between: Chapter One
Together in Between is a first-person adventure-puzzle game. You have been imprisoned in a magic book with your partner, in the same place but in different dimensions. Will you be able to overcome the Wizard-King's puzzles, and see your partner again?
Smack Studio
A sandbox fighting game with built-in creation tools to create characters and stages. Animate pixel art characters using our 3D pixel art rotation technology, then battle with up to 8 players! Use our tools to export sprites for your own projects.
Sword of Convallaria
Fantasy Tactical RPG revitalizing the beloved Japanese turn-based & pixel art genre. Collect & train a roster of mercenaries, customize your squad, and use your own strategy to save the nation of Iria. Journey through a world of plot twists where every choice you make will reshape your destiny.
Super Sus
Welcome to join the multiplayer social deduction game - Super Sus! Engage in intense gameplay with global players, as you strategize to safeguard your spaceship from the cunning Impostors determined to sabotage the mission and eliminate everyone aboard!
Mini Airways - ATC simulator
Mini Airways is a real-time management game where you play the role of an air traffic controller. Clear your aircraft to takeoff & land, direct them to the destination...and most of all don't let them crash!! London, Tokyo, Shanghai... Test your ATC skills in distinctive maps around the globe!
Elder Legacy
This is a role-playing game with survival elements. Embark on a heartfelt journey inspired by Boreyian myths and legends, filled with vibrant and unforgettable adventures, uncover the mystery behind the attempt to conquer the noble Boreyian people.
EARTH DEFENSE FORCE 6
Live the future of despair.The year is 2024 AD. The survivors fought against the remaining threats while trying their best to continue their recovery.Three years passed in the year 2027. In a new world without hope, the time has come to once again resist the fate of the Earth.
Let's Minesweeper
This is an online Minesweeper game that allows worldwide players to play simultaneously! Across 48 million tiles, each game has over 10 million mines. Dive into a minefield, claim your territory, clear the mines and have fun!
Lost Castle 2
"Lost Castle 2" is a 2D Beat'em up Rogue-Lite game. Explore abundant treasures and items to enhance yourself, master various weapons to showcase your skills, and challenge powerful monsters to demonstrate your strength. A new adventure is calling for treasure hunters!
TerraScape
Build gorgeous kingdoms on floating islands by strategically placing buildings in this cozy City-Puzzler. Discover secret combinations, take on weekly challenges and explore randomly generated maps in various single- and multiplayer game modes.
Enlisted
In Enlisted, you are not only commanding a single soldier, but an entire squad! This MMO squad based shooter recreates the key battles of the bloodiest war of the 20th century, with hundreds of soldiers, tanks and aircraft taking part in each battle.
Arcanists
Players take turns in a race against the clock, utilising an array of spells to defeat their opponents in battle! Victory is accomplished by becoming the 'last man standing' (or last team) after all other players have been reduced to zero hitpoints.
Battle Grounds III
After 6 years of development, Battle Grounds III (BG3) is the next iteration in the classic franchise which began 17 years ago. Prepare for battle in the American War of Independence!
Project Unknown
An online co-op horror game featuring unique playable characters and RPG mechanics. Exorcise ghosts using your special abilities and tools while surviving the supernatural onslaught
DeathWatchers
Use the specialized equipment at your disposal to locate & log as many paranormal events as possible. Decipher the ingredients needed for your ritual and try to exorcise any demons within. Any incorrect ingredients and you may never leave! 1-4 Players
Once Human
Once Human is a multiplayer open-world survival game set in a strange, post-apocalyptic future. Unite with friends to fight monstrous enemies, uncover secret plots, compete for resources, and build your own territory. Once, you were merely human. Now, you have the power to remake the world.
Figure Adventure
"Figure Adventure" is a trendy game with the theme of hand-made figures, which integrates card cultivation and placement and hang-up gameplay!
KunKun dream Startles the Soul
Multiplayer , yes! You have been trapped in KunKun's dream, you and your trapped companions have to find a way to escape and avoid these Grotesque Object! Grotesque Objectlike playing basketball and worship chickens, hate watermelons, and even come Let me see
ASKA
Lay claim to unspoiled lands and pave the way for a fierce Viking tribe. Craft the ultimate settlement solo or together with up to x3 friends. Trust in the Gods and the power of the Eye of Odin and summon intelligent NPC villagers to provide camaraderie and relief from the toils of survival.
Everafter Falls
Rediscover the simple life. Farm, fish, forge and fight to restore the peace in an all-new farming adventure. Features split-screen coop, a helpful pet, automated drones, resourceful pixies, a card-eating progression system, and dangerous dungeons to delve into!
Most played co-op games on Steam
Take a look at the top co-op games that are currently attracting the largest player bases on the Steam platform, as of June 15th 2025.
1. Dead by Daylight
Trapped forever in a realm of eldritch evil where even death is not an escape, four determined Survivors face a bloodthirsty Killer in a vicious game of nerve and wits. Pick a side and step into a world of tension and terror with horror gaming's best asymmetrical multiplayer. Dead by Daylight is a horror, multiplayer and survival horror game developed and published by Behaviour Interactive Inc.. Released on June 14th 2016 has received 797,216 reviews of which 630,223 were positive and 166,993 were negative resulting in a rating of 7.9 out of 10. The game has hit the top spot as the #1 most played co-op game, thanks to its 48,439 peak concurrent players over the last day.
7.9
630,223
166,993
48,439
players
2. R.E.P.O.
An online co-op horror game with up to 6 players. Locate valuable, fully physics-based objects and handle them with care as you retrieve and extract to satisfy your creator's desires. R.E.P.O. is a horror, online co-op and multiplayer game developed and published by semiwork. Released on February 26th 2025 has received 185,642 reviews of which 179,154 were positive and 6,488 were negative resulting in an impressive rating of 9.5 out of 10. While seeing 39,619 players online at once in the last 24 hours, this game is currently ranked #2 among co-op games based on player count.
9.5
179,154
6,488
39,619
players
3. Left 4 Dead 2
Set in the zombie apocalypse, Left 4 Dead 2 (L4D2) is the highly anticipated sequel to the award-winning Left 4 Dead, the #1 co-op game of 2008. This co-operative action horror FPS takes you and your friends through the cities, swamps and cemeteries of the Deep South, from Savannah to New Orleans across five expansive campaigns. Left 4 Dead 2 is a zombies, co-op and fps game developed and published by Valve. Released on November 16th 2009 has received 963,983 reviews of which 940,221 were positive and 23,762 were negative resulting in an impressive rating of 9.7 out of 10. While seeing 30,782 players online at once in the last 24 hours, this game is currently ranked #3 among co-op games based on player count.
9.7
940,221
23,762
30,782
players
4. Schedule I
From small-time dope pusher to kingpin - manufacture and distribute a range of drugs throughout the grungy city of Hyland Point. Expand your empire with properties, businesses, employees and more. Schedule I is a simulation, co-op and crime game developed and published by TVGS. Released on March 24th 2025 has received 204,041 reviews of which 200,803 were positive and 3,238 were negative resulting in an impressive rating of 9.7 out of 10. With 24,436 concurrent players in the last 24 hours, the game currently holds the #4 spot among the most played co-op games.
9.7
200,803
3,238
24,436
players
5. PAYDAY 2
PAYDAY 2 is an action-packed, four-player co-op shooter that once again lets gamers don the masks of the original PAYDAY crew - Dallas, Hoxton, Wolf and Chains - as they descend on Washington DC for an epic crime spree. PAYDAY 2 is a co-op, action and fps game developed by OVERKILL - a Starbreeze Studio. and published by Starbreeze Publishing AB. Released on August 13th 2013 has received 663,082 reviews of which 594,327 were positive and 68,755 were negative resulting in a rating of 8.9 out of 10. With 23,535 concurrent players in the last 24 hours, the game currently holds the #5 spot among the most played co-op games.
8.9
594,327
68,755
23,535
players
6. Don't Starve Together
Fight, Farm, Build and Explore Together in the standalone multiplayer expansion to the uncompromising wilderness survival game, Don't Starve. Don't Starve Together is a survival, open world survival craft and multiplayer game developed and published by Klei Entertainment. Released on April 21st 2016 has received 499,061 reviews of which 475,393 were positive and 23,668 were negative resulting in an impressive rating of 9.4 out of 10. With 14,957 concurrent players in the last 24 hours, the game currently holds the #6 spot among the most played co-op games.
9.4
475,393
23,668
14,957
players
7. Phasmophobia
Phasmophobia is a 4 player online co-op psychological horror. Paranormal activity is on the rise and it’s up to you and your team to use all the ghost-hunting equipment at your disposal in order to gather as much evidence as you can. Phasmophobia is a horror, online co-op and multiplayer game developed and published by Kinetic Games. Released on September 18th 2020 has received 768,779 reviews of which 736,611 were positive and 32,168 were negative resulting in an impressive rating of 9.5 out of 10. With 13,083 concurrent players in the last 24 hours, the game currently holds the #7 spot among the most played co-op games.
9.5
736,611
32,168
13,083
players
8. Borderlands 2
The Ultimate Vault Hunter’s Upgrade lets you get the most out of the Borderlands 2 experience. Borderlands 2 is a loot, shooter and action game developed by Gearbox Software, Aspyr (Mac) and Aspyr (Linux) and published by Aspyr (Mac), Aspyr (Linux) and 2K. Released on September 20th 2012 has received 295,218 reviews of which 272,900 were positive and 22,318 were negative resulting in an impressive rating of 9.2 out of 10. With 10,687 concurrent players in the last 24 hours, the game currently holds the #8 spot among the most played co-op games.
9.2
272,900
22,318
10,687
players
9. Risk of Rain 2
Escape a chaotic alien planet by fighting through hordes of frenzied monsters – with your friends, or on your own. Combine loot in surprising ways and master each character until you become the havoc you feared upon your first crash landing. Risk of Rain 2 is a third-person shooter, action roguelike and multiplayer game developed by Hopoo Games and published by Gearbox Publishing. Released on August 11th 2020 has received 313,577 reviews of which 293,127 were positive and 20,450 were negative resulting in an impressive rating of 9.3 out of 10. With 8,881 concurrent players in the last 24 hours, the game currently holds the #9 spot among the most played co-op games.
9.3
293,127
20,450
8,881
players
10. Grounded
The world is a vast, beautiful and dangerous place – especially when you have been shrunk to the size of an ant. Can you thrive alongside the hordes of giant insects, fighting to survive the perils of the backyard? Grounded is a survival, multiplayer and co-op game developed by Obsidian Entertainment and published by Xbox Game Studios. Released on September 27th 2022 has received 84,517 reviews of which 75,482 were positive and 9,035 were negative resulting in a rating of 8.8 out of 10. With 8,101 concurrent players in the last 24 hours, the game currently holds the #10 spot among the most played co-op games.
8.8
75,482
9,035
8,101
players
Best deals on co-op games on Steam
Discover fantastic savings with the best discounts on a variety of co-op games available on Steam right now, updated on June 15th 2025. Looking for even more deals? Use the search filters to explore a wider range of discounted co-op games.
1. Strange Brigade
Embark on an exotic journey into danger in this rip-roaring 1930s third person adventure for 1-4 players! Encounter pulse-pounding action, treacherous traps and tales of derring-do! Strange Brigade is a action, adventure and co-op game developed and published by Rebellion. Released on August 27th 2018 has received 10,728 reviews of which 9,034 were positive and 1,694 were negative resulting in a rating of 8.2 out of 10. Featuring a massive 99% discount, this game currently holds the #1 spot in the best deals for co-op category.
8.2
9,034
1,694
-99%
49.99€
0.82€
2. Warhammer: End Times - Vermintide
Vermintide is an epic co-operative action combat adventure set in the End Times of the iconic Warhammer Fantasy world. Warhammer: End Times - Vermintide is a action, online co-op and co-op game developed and published by Fatshark. Released on October 23rd 2015 has received 21,090 reviews of which 16,874 were positive and 4,216 were negative resulting in a rating of 7.9 out of 10. Thanks to its incredible 99% discount, this game is now the #2 best deal in co-op games.
7.9
16,874
4,216
-99%
28.99€
0.48€
3. The Ascent
The Ascent is a solo and co-op Action-shooter RPG set in a cyberpunk world. The mega corporation that owns you and everyone, The Ascent Group, has just collapsed. Can you survive without it? The Ascent is a top-down shooter, cyberpunk and rpg game developed by Neon Giant and published by Curve Games. Released on July 29th 2021 has received 22,884 reviews of which 16,932 were positive and 5,952 were negative resulting in a rating of 7.3 out of 10. Thanks to its incredible 99% discount, this game is now the #3 best deal in co-op games.
7.3
16,932
5,952
-99%
29.99€
0.49€
4. This Means Warp
It’s co-op space survival fun, Jim, but not as we know it. This Means Warp is an intense spaceship management roguelite experience for 1-4 players. Explore a procedurally generated universe, upgrade your ship, battle dangerous enemies and adapt your strategies to survive in a hostile galaxy. This Means Warp is a survival, online co-op and space game developed by Outlier and published by Jagex Ltd. Released on May 04th 2023 has received 627 reviews of which 447 were positive and 180 were negative resulting in a rating of 6.8 out of 10. Currently offered at a significant 99% discount, this title has earned the #4 position in the best deals for co-op games.
6.8
447
180
-99%
19.50€
0.38€
5. Battletoads
• Over-the-top combat with combos and hard-hitting morph attacks • Wild, varied gameplay sequences for all types of gamers • Hand-drawn animation feels like playing a cartoon • Drop-in couch co-op for three players Battletoads is a action, adventure and co-op game developed by Dlala Studios and published by Microsoft Studios and Rare Ltd. Released on August 20th 2020 has received 2,125 reviews of which 1,450 were positive and 675 were negative resulting in a rating of 6.6 out of 10. Currently offered at a significant 99% discount, this title has earned the #5 position in the best deals for co-op games.
6.6
1,450
675
-99%
19.99€
0.32€
6. X-Morph: Defense
Unique fusion of a top-down shooter and tower defense strategy. You are the invader! Use destructive weapons or lead your enemies into a maze of towers. Strategize in the build mode by carefully selecting various types of alien towers or throw yourself right into the heat of the battle. X-Morph: Defense is a tower defense, strategy and action game developed by and published by Exor Studios. Released on August 30th 2017 has received 3,823 reviews of which 3,506 were positive and 317 were negative resulting in a rating of 8.8 out of 10. Currently offered at a significant 98% discount, this title has earned the #6 position in the best deals for co-op games.
8.8
3,506
317
-98%
19.99€
0.54€
7. BattleGroupVR
BattleGroupVR is a first person real-time space strategy where you lead a fleet of powerful warships into battle from the bridge of your own flagship. Assemble your fleet, upgrade your load-outs, train your captains, engage the enemy and secure the sector. Try not to go down with the ship. BattleGroupVR is a space sim, space and vr game developed and published by SpaceOwl Games. Released on July 31st 2023 has received 902 reviews of which 834 were positive and 68 were negative resulting in a rating of 8.7 out of 10. Currently offered at a significant 98% discount, this title has earned the #7 position in the best deals for co-op games.
8.7
834
68
-98%
20.99€
0.42€
8. Trine 4: The Nightmare Prince
The best-selling Trine series returns to the magic of 2.5D! Join three iconic heroes as they set off on a quest through fantastical fairytale landscapes to save the world from the Nightmare Prince’s shadows. Trine 4: The Nightmare Prince is a puzzle-platformer, local co-op and online co-op game developed and published by Frozenbyte. Released on October 08th 2019 has received 13,379 reviews of which 11,924 were positive and 1,455 were negative resulting in a rating of 8.7 out of 10. Currently offered at a significant 98% discount, this title has earned the #8 position in the best deals for co-op games.
8.7
11,924
1,455
-98%
29.99€
0.62€
9. King Of The Castle
Take your rightful place on the throne in this political party game for 4+ players. Rule the kingdom with an iron fist or silver tongue as you steer through bloodshed, intrigue & madcap disaster! Can you keep your crown when others plot your downfall? More importantly, can you keep your head? King Of The Castle is a strategy, choices matter and fantasy game developed by Tributary Games and published by Team17. Released on March 02nd 2023 has received 1,456 reviews of which 1,293 were positive and 163 were negative resulting in a rating of 8.5 out of 10. Currently offered at a significant 98% discount, this title has earned the #9 position in the best deals for co-op games.
8.5
1,293
163
-98%
9.99€
0.23€
10. AI War 2
The most devious and acclaimed artificial intelligence in strategy gaming is better than ever. A grand strategy/RTS hybrid that reverses many conventions of both genres. Take territory without attracting attention, build your empire with care, and adapt to an ever-evolving galactic battleground. AI War 2 is a 4x, grand strategy and multiplayer game developed and published by Arcen Games and LLC. Released on October 22nd 2019 has received 1,490 reviews of which 1,318 were positive and 172 were negative resulting in a rating of 8.4 out of 10. Currently offered at a significant 98% discount, this title has earned the #10 position in the best deals for co-op games.
8.4
1,318
172
-98%
19.50€
0.49€
Free co-op games on Steam
Check out this fantastic list of free-to-play co-op games you can enjoy on Steam right now, updated on June 15th 2025. Looking for even more free titles? Use the search filters to explore a wider range of free to play co-op games.
1. World of Warships
Immerse yourself in thrilling naval battles and assemble an armada of over 600 ships from the first half of the 20th century — from stealthy destroyers to gigantic battleships. Change the look of your ship, choose upgrades to suit your play style, and go into battle with other players! World of Warships is a free to play, naval combat and action game developed and published by Wargaming Group Limited. Released on November 15th 2017 has received 146,552 reviews of which 112,887 were positive and 33,665 were negative resulting in a rating of 7.6 out of 10. With 4,646 active players enjoying it for free, this strategy game has reached the #1 spot among the top free co-op games on Steam.
7.6
112,887
33,665
4,646
players
2. SCP: Secret Laboratory
Deep within a secure underground facility, a sudden containment breach allows many of the secured anomalies to escape from their chambers. Assist the Foundation in re-securing the facility, help the Insurgency in their goal to capture it, or wreak havoc as an SCP in a frantic bid to escape. SCP: Secret Laboratory is a free to play, multiplayer and horror game developed and published by Northwood Studios. Released on December 29th 2017 has received 214,309 reviews of which 195,923 were positive and 18,386 were negative resulting in an impressive rating of 9.0 out of 10. Thanks to its free to play tag and a daily player base of 3,252, this co-op game has secured the #2 spot in the ranking of free co-op games on Steam.
9.0
195,923
18,386
3,252
players
3. One-armed robber
One-armed robber is a chaotic first-person heist game that centers around a uniquely challenging premise. Players take the role of a determined robber equipped with only one arm, tasked with pulling off daring heists on banks, shops, and various establishments. One-armed robber is a free to play, multiplayer and heist game developed and published by Duhndal. Released on December 15th 2023 has received 38,728 reviews of which 35,393 were positive and 3,335 were negative resulting in a rating of 9.0 out of 10. Thanks to its free to play tag and a daily player base of 965, this co-op game has secured the #3 spot in the ranking of free co-op games on Steam.
9.0
35,393
3,335
965
players
4. Caliber
Caliber is a team-based online shooter focused on special forces units from all over the world. More than 70 operators with unique abilities and weapons as well as various game modes and maps are waiting for you. Caliber is a multiplayer, free to play and combat game developed by 1C Game Studios and published by FOR-GAMES CR LTD. Released on April 12th 2023 has received 20,618 reviews of which 15,691 were positive and 4,927 were negative resulting in a rating of 7.5 out of 10. Attracting a solid base of 390 players due to its free access, this strategy game has achieved the #4 position in the best free co-op games on Steam.
7.5
15,691
4,927
390
players
5. Sven Co-op
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. Sven Co-op is a co-op, fps and online co-op game developed and published by Sven Co-op team. Released on January 22nd 2016 has received 31,316 reviews of which 29,316 were positive and 2,000 were negative resulting in an impressive rating of 9.2 out of 10. Attracting a solid base of 317 players due to its free access, this strategy game has achieved the #5 position in the best free co-op games on Steam.
9.2
29,316
2,000
317
players
6. One-armed cook
One-armed cook is a chaotic co-op cooking game for up to 4 people. Work as a team or cook on your own, set your own pace, and don't let the stress of a full restaurant catch up to you. The goofy physics-based aspect of the game gives this cooking game a new twist. One-armed cook is a multiplayer, free to play and co-op game developed and published by Duhndal. Released on August 30th 2022 has received 28,328 reviews of which 26,087 were positive and 2,241 were negative resulting in an impressive rating of 9.0 out of 10. Attracting a solid base of 288 players due to its free access, this strategy game has achieved the #6 position in the best free co-op games on Steam.
9.0
26,087
2,241
288
players
7. We Were Here
Lost in a frozen wasteland and split up from your partner inside an abandoned castle, the only possession you have left is a walkie-talkie with a familiar voice on the other end. Can the two of you find your way out in time? We Were Here is a free to play, co-op and escape room game developed and published by Total Mayhem Games. Released on February 03rd 2017 has received 29,997 reviews of which 27,014 were positive and 2,983 were negative resulting in a rating of 8.8 out of 10. Attracting a solid base of 236 players due to its free access, this strategy game has achieved the #7 position in the best free co-op games on Steam.
8.8
27,014
2,983
236
players
8. Alien Swarm: Reactive Drop
Co-operative top-down shooter game available for free. An epic bug hunt featuring a unique blend of co-op play and squad-level tactics. Alien Swarm: Reactive Drop is a twin stick shooter, pve and top-down shooter game developed and published by Reactive Drop Team. Released on April 20th 2017 has received 22,649 reviews of which 21,500 were positive and 1,149 were negative resulting in an impressive rating of 9.3 out of 10. Attracting a solid base of 182 players due to its free access, this strategy game has achieved the #8 position in the best free co-op games on Steam.
9.3
21,500
1,149
182
players
9. Otherworld Legends 战魂铭人
A "blood-pumping, face-bashing" roguelike brawler. Master heroes of your choice, craft uniquely broken builds, and hack & pummel through a myriad of dungeons in a thrilling rampage. Otherworld Legends 战魂铭人 is a co-op, rpg and action game developed and published by ChillyRoom. Released on October 30th 2024 has received 1,287 reviews of which 802 were positive and 485 were negative resulting in a rating of 6.1 out of 10. The game currently holds the #9 spot among the most played free co-op games on Steam.
6.1
802
485
94
players
10. Dodgy Deliveries
Co-op "Horror" game about running a delivery service with your friends! B̵̨̦͓͖̹̪̥̮͛̀̏̈́̐̔̉Ę̴̤̦̤͓̰̤́͗̚ ̵̨̺͓̱̞͔͉͙̀̂͂͋͠͠Ç̸̫͈̋͋͆̋̾̑̕͜Ä̴̛̟͑͛͋͂̌̕͜͝R̵̛͎̮̜̒̽̈́͂̓̒͘Ę̸͉̙̎̀͐͆Ḟ̶̼͖̭͇̗U̸̡̫͇̤̭̪̦̣̔Ḷ̶̛͖̙͗̋̈̇̕ ̷̡̢͕̦̜͚̌̎̃̔Ā̷̧͇͎̳͔̩̜̤̗͊̋Ţ̸̭̩͚̮͖͇̹̬̾ ̷͍̞̰͈̻̣͚̂̾ͅN̵̛̤͒̏̒͝Ḯ̵̡̘͇̖̏͘Ģ̸̛͙̥̞̽̀͒͜H̶̲̜̺̐̄͋͊̍̈́͘͜T̴̯̲̳̪͚̜̼̈͠ Dodgy Deliveries is a online co-op, horror and co-op game developed by Tomas Gonzalez and German Rieck and published by Deliver Games. Released on January 31st 2025 has received 1,033 reviews of which 764 were positive and 269 were negative resulting in a rating of 7.1 out of 10. The game currently holds the #10 spot among the most played free co-op games on Steam.
7.1
764
269
88
players