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

Call to Arms - Gates of Hell: Ostfront

Call to Arms - Gates of Hell is a realistic RTS/ RTT game that offers endless replay value. Command all types of troops in historical singleplayer, dynamic campaign, PvP and PvE battles. Are you ready for some serious immersion in World War 2?

Price 34.99€
Rating 8.2
Release 11 Jun 2021

Chicory: A Colorful Tale

A top-down adventure game in a coloring book world full of vibrant characters. Use painting powers to explore, solve puzzles, make friends, and draw on anything! From creators on Wandersong + Celeste.

Price 19.50€
Rating 9.4
Release 10 Jun 2021

Mighty Goose

Mighty Goose is a fast paced run & gun shooter starring a bounty hunter Goose. Use epic weapons and devastating war machines to battle against screen filling bosses and hordes of enemies!

Price -70% 5.03€
Rating 8.2
Release 05 Jun 2021

Tennis Elbow 4

Created by and for tennis fans, Tennis Elbow 4 is the sequel of TE2013, and offers a tennis simulation with an easy and intuitive learning curve, but with exceptional gameplay depth.

Price -20% 23.99€
Rating 8.8
Release 04 Jun 2021

Operation: Tango

It takes two to save the world in this cooperative spy adventure. Pair up with a friend as Agent or Hacker—with only your voices to connect you—and work together to bring a hi-tech global menace to its knees. Now with a FREE CONTENT UPDATE!

Price -70% 5.15€
Rating 8.5
Release 01 Jun 2021

Chased by Darkness

Chased by Darkness is a 1-4 players co-op survival horror. Your mission is to face supernatural entities and banish them to the spiritual plane. Explore, fight enemies and don't let the darkness reach you.

Price 3.99€
Rating 6.9
Release 01 Jun 2021

FPV SkyDive : FPV Drone Simulator

FPV SkyDive is a free-to-play realistic drone racing and freestyle simulator. Feel the adrenaline of high speed first-person view drone racing in single-player or multi-player scenarios. The future is now, become an FPV pilot today!

Price Free to play
Rating 7.9
Release 31 May 2021

EARTH DEFENSE FORCE: WORLD BROTHERS

A new EDF adventure begins! Only this time, the action unfolds in a parallel world where the Earth is made of digital blocks. This world has befallen into chaos, as the once peaceful square Earth has been shattered into pieces. Shape aside, it is an Earth nonetheless which needs to be defended.

Price -85% 6.13€
Rating 7.7
Release 27 May 2021

MechWarrior 5: Mercenaries

The year is 3015. The battlefields are dominated by war machines known as BattleMechs. Level entire cities and decimate the enemy in your BattleMech. Follow a quest for glory and revenge. Manage an expanding mercenary company. Fight alongside your friends with a four-player PvE co-op.

Price -61% 11.56€
Rating 8.3
Release 26 May 2021

Just Die Already

Just Die Already is an old people mayhem sandbox game created by the designers of Goat Simulator. You are old and angry and you've just been kicked out of your retirement home. How will you survive in a world that wants you to Just Die Already?

Price -86% 2.00€
Rating 8.0
Release 20 May 2021

Come with Me

Come with Me is a two-player cooperative game set in a puzzle filled magical world. Solve puzzles together by using your special abilities and collect memories to uncover the mystery of the world around you.

Price Free to play
Rating 7.1
Release 14 May 2021

HUNTDOWN

In the mayhem-filled streets of the future where criminal gangs rule and cops fear to tread, only the bounty hunters can free the city from the corrupt fist of felony. Lay waste to the criminal underworld and make a killing in this hard boiled action comedy arcade shooter.

Price -79% 4.16€
Rating 9.1
Release 12 May 2021

Soulworker

Fierce emotions help fuel SoulWorkers to save the world from the devastated scene of a post-apocalyptic world. In a world where only dark devastation reigns – you are the only SoulWorker to come to the rescue.

Price Free to play
Rating 7.0
Release 12 May 2021

PICO PARK

PICO PARK is a cooperative local/online multiplay action puzzle game for 2-8 players.

Price 3.99€
Rating 8.9
Release 07 May 2021

Deadswitch 3

Deadswitch 3 is a fast-paced 2D multiplayer shooter. Experience action-packed combat with hundreds of weapons and multiple solo and team-based game modes.

Price Free to play
Rating 7.2
Release 07 May 2021

Demeo

Adventurers, it’s time to unite! Gather your friends and battle the dark forces that have overtaken the world of Resolution Games' award-winning RPG dungeon crawler, Demeo. The next generation of tabletop adventure has arrived!

Price 38.99€
Rating 8.6
Release 06 May 2021

World of Tanks

Jump into the free-to-play team-based shooter with an ever-expanding roster of historical vehicles, stunning graphics, spectacular locales, and orchestral scores. Show your mastery and face other players in thrilling PvP clashes. A unique mix of strategy and action awaits!

Price Free to play
Rating 8.3
Release 28 Apr 2021

GangV | VR & PC Battle Royale

Made for PC and VR featuring an Online Open World. A Battle Royale unlike any other with traffic, crowds, and law enforcement! Steal money, equipment, and vehicles and face the consequences. Hide among civilians to kill your opponents.

Price 13.99€
Rating 6.1
Release 16 Apr 2021

Tree Simulator 2022

It's exactly what it sounds like, but now with 100% more multiplayer. You are the tree and so is everyone else! You are equaled by no other, except maybe the forest... Relax and be the best tree you can be.

Price 5.89€
Rating 9.2
Release 16 Apr 2021

Lunch Lady

Lunch Lady is a 1-4 player online co-op survival horror game. The school final exams are coming up and the best idea you and your friends had was to steal the test answers. Find all 10 pages and don't get caught by the murderous Lunch Lady!

Price 4.99€
Rating 8.4
Release 15 Apr 2021

Hired Ops

Hired Ops is a session-based online shooter dedicated to fierce conflicts between rival mercenary groups battling on a global scale.

Price Free to play
Rating 6.6
Release 13 Apr 2021

SMASH LEGENDS

Play Smash Legends for free! Smash Legends is an exciting PVP action brawler where fairy tale Legends engage in a lively battle. Play solo or in a 3v3 team battle with your friends! Play now with Smashers from all over the world on Steam, iOS, and Android!

Price Free to play
Rating 6.8
Release 12 Apr 2021

Hobo: Tough Life

Hobo: Tough Life is an urban survival role-playing game where you play as a homeless person. Play alone or team up in online co-op. Explore the streets of Praslav, scavenge for food and supplies, beg, steal, and do whatever else it takes to survive the forthcoming winter.

Price 28.99€
Rating 8.2
Release 12 Apr 2021

Element TD 2 - Tower Defense

Element TD 2 sees you combine powerful elements to create unique towers. Prove your defenses against challenging foes, and compete or cooperate with others to determine who has mastered the elements.

Price 14.00€
Rating 8.6
Release 02 Apr 2021

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 April 16th 2025.

1. 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 129,494 reviews of which 127,649 were positive and 1,845 were negative resulting in an impressive rating of 9.7 out of 10. The game has hit the top spot as the #1 most played co-op game, thanks to its 214,533 peak concurrent players over the last day.
9.7
127,649
1,845

214,533
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 comedy game developed and published by semiwork. Released on February 26th 2025 has received 105,828 reviews of which 102,099 were positive and 3,729 were negative resulting in an impressive rating of 9.5 out of 10. While seeing 89,976 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
102,099
3,729

89,976
players

3. 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 786,824 reviews of which 621,871 were positive and 164,953 were negative resulting in a rating of 7.9 out of 10. While seeing 37,251 players online at once in the last 24 hours, this game is currently ranked #3 among co-op games based on player count.
7.9
621,871
164,953

37,251
players

4. 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 952,732 reviews of which 929,269 were positive and 23,463 were negative resulting in an impressive rating of 9.7 out of 10. With 20,169 concurrent players in the last 24 hours, the game currently holds the #4 spot among the most played co-op games.
9.7
929,269
23,463

20,169
players

5. Warhammer 40,000: Space Marine 2

Embody the superhuman skill and brutality of a Space Marine. Unleash deadly abilities and devastating weaponry to obliterate the relentless Tyranid swarms. Defend the Imperium in spectacular third-person action in solo or multiplayer modes. Warhammer 40,000: Space Marine 2 is a warhammer 40k, action and third-person shooter game developed by Saber Interactive and published by Focus Entertainment. Released on September 09th 2024 has received 157,413 reviews of which 130,499 were positive and 26,914 were negative resulting in a rating of 8.2 out of 10. With 12,970 concurrent players in the last 24 hours, the game currently holds the #5 spot among the most played co-op games.
8.2
130,499
26,914

12,970
players

6. 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 762,073 reviews of which 730,347 were positive and 31,726 were negative resulting in an impressive rating of 9.5 out of 10. With 10,531 concurrent players in the last 24 hours, the game currently holds the #6 spot among the most played co-op games.
9.5
730,347
31,726

10,531
players

7. 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 662,674 reviews of which 593,923 were positive and 68,751 were negative resulting in a rating of 8.9 out of 10. With 9,999 concurrent players in the last 24 hours, the game currently holds the #7 spot among the most played co-op games.
8.9
593,923
68,751

9,999
players

8. 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 493,660 reviews of which 470,616 were positive and 23,044 were negative resulting in an impressive rating of 9.5 out of 10. With 9,417 concurrent players in the last 24 hours, the game currently holds the #8 spot among the most played co-op games.
9.5
470,616
23,044

9,417
players

9. Sons Of The Forest

Sent to find a missing billionaire on a remote island, you find yourself in a cannibal-infested hellscape. Craft, build, and struggle to survive, alone or with friends, in this terrifying new open-world survival horror simulator. Sons Of The Forest is a survival, open world and multiplayer game developed by Endnight Games Ltd and published by Newnight . Released on February 22nd 2024 has received 248,117 reviews of which 217,551 were positive and 30,566 were negative resulting in a rating of 8.7 out of 10. With 9,115 concurrent players in the last 24 hours, the game currently holds the #9 spot among the most played co-op games.
8.7
217,551
30,566

9,115
players

10. Monster Hunter: World

Welcome to a new world! In Monster Hunter: World, the latest installment in the series, you can enjoy the ultimate hunting experience, using everything at your disposal to hunt monsters in a new world teeming with surprises and excitement. Monster Hunter: World is a co-op, multiplayer and action game developed and published by CAPCOM Co. and Ltd.. Released on August 08th 2018 has received 489,007 reviews of which 430,193 were positive and 58,814 were negative resulting in a rating of 8.7 out of 10. With 6,481 concurrent players in the last 24 hours, the game currently holds the #10 spot among the most played co-op games.
8.7
430,193
58,814

6,481
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 April 16th 2025. Looking for even more deals? Use the search filters to explore a wider range of discounted co-op games.

1. 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 22,668 reviews of which 16,799 were positive and 5,869 were negative resulting in a rating of 7.3 out of 10. Featuring a massive 97% discount, this game currently holds the #1 spot in the best deals for co-op category.
7.3
16,799
5,869

-97% 34.00€ 1.02€

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 21,033 reviews of which 16,834 were positive and 4,199 were negative resulting in a rating of 7.9 out of 10. Thanks to its incredible 95% discount, this game is now the #2 best deal in co-op games.
7.9
16,834
4,199

-95% 29.20€ 1.46€

3. Kitaria Fables

Action Adventure fused with RPG and Farming elements. Armed with sword, bow and spellbook, fight against a rising darkness threatening the world. Plunder dungeons in search of relics and resources, tend to your farm to make provisions and potions, and take on quests solo, or with a friend! Kitaria Fables is a co-op, action rpg and farming sim game developed by Twin Hearts and published by PQube. Released on September 01st 2021 has received 1,497 reviews of which 1,079 were positive and 418 were negative resulting in a rating of 7.0 out of 10. Thanks to its incredible 95% discount, this game is now the #3 best deal in co-op games.
7.0
1,079
418

-95% 20.40€ 1.02€

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 620 reviews of which 445 were positive and 175 were negative resulting in a rating of 6.9 out of 10. Currently offered at a significant 95% discount, this title has earned the #4 position in the best deals for co-op games.
6.9
445
175

-95% 20.00€ 1.00€

5. 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 13,203 reviews of which 11,784 were positive and 1,419 were negative resulting in a rating of 8.7 out of 10. Currently offered at a significant 93% discount, this title has earned the #5 position in the best deals for co-op games.
8.7
11,784
1,419

-93% 30.29€ 2.12€

6. Borderlands: The Pre-Sequel

Launch into the Borderlands universe and shoot ‘n’ loot your way through a brand new adventure that rockets you onto Pandora’s moon in Borderlands: The Pre-Sequel! Borderlands: The Pre-Sequel is a looter shooter, co-op and fps game developed by 2K Australia, Gearbox Software and Aspyr (Linux) and published by Aspyr (Linux) and 2K. Released on October 16th 2014 has received 41,144 reviews of which 33,531 were positive and 7,613 were negative resulting in a rating of 8.0 out of 10. Currently offered at a significant 93% discount, this title has earned the #6 position in the best deals for co-op games.
8.0
33,531
7,613

-93% 41.86€ 2.93€

7. Shift Happens

Shift Happens is a cooperative platformer for two. You and a friend shift your mass, throw each other and puzzle your way through four stages of stylized imaginary worlds. Including the occasional backstabbing and taunting. Play with a friend on a couch, online or even special singleplayer levels. Shift Happens is a co-op, online co-op and local co-op game developed by Klonk Games and published by Daedalic Entertainment. Released on February 22nd 2017 has received 3,969 reviews of which 3,140 were positive and 829 were negative resulting in a rating of 7.7 out of 10. Currently offered at a significant 93% discount, this title has earned the #7 position in the best deals for co-op games.
7.7
3,140
829

-93% 14.71€ 1.03€

8. F.E.A.R. 3

F.E.A.R. 3 delivers all the hallmarks that define the F.E.A.R. brand: terrifying paranormal experience, frenetic combat and a dramatic storyline. F.E.A.R. 3 is a fps, horror and co-op game developed by Day 1 Studios and published by Warner Bros. Interactive Entertainment. Released on June 21st 2011 has received 12,621 reviews of which 8,996 were positive and 3,625 were negative resulting in a rating of 7 out of 10. Currently offered at a significant 93% discount, this title has earned the #8 position in the best deals for co-op games.
7
8,996
3,625

-93% 19.71€ 1.38€

9. From Space

From Space is a solo and co-op action-shooter for squads up to four players. Take on the challenge of liberating the earth from an alien infestation with your friends, using over-the-top weaponry in a post-apocalyptic world with awesomely stylized graphics. The apocalypse has never been so much fun! From Space is a action, co-op and online co-op game developed by Triangle Studios and published by Curve Games. Released on November 03rd 2022 has received 1,874 reviews of which 1,269 were positive and 605 were negative resulting in a rating of 6.6 out of 10. Currently offered at a significant 93% discount, this title has earned the #9 position in the best deals for co-op games.
6.6
1,269
605

-93% 14.29€ 1.00€

10. KeyWe

KeyWe is a cute, co-operative postal puzzler starring Jeff and Debra, two small kiwi birds working in a whimsical post office. They must jump, flap, peck and butt-slam their way across an interactive landscape of levers, bells and buttons to get those messages delivered on time! KeyWe is a co-op, puzzle-platformer and cute game developed by Stonewheat & Sons and published by Fireshine Games. Released on August 31st 2021 has received 1,789 reviews of which 1,619 were positive and 170 were negative resulting in a rating of 8.6 out of 10. Currently offered at a significant 92% discount, this title has earned the #10 position in the best deals for co-op games.
8.6
1,619
170

-92% 25.00€ 2.00€

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 April 16th 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 co-op game developed and published by Wargaming Group Limited. Released on November 15th 2017 has received 145,674 reviews of which 112,392 were positive and 33,282 were negative resulting in a rating of 7.6 out of 10. With 5,876 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
112,392
33,282

5,876
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 211,312 reviews of which 193,314 were positive and 17,998 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 2,104, this co-op game has secured the #2 spot in the ranking of free co-op games on Steam.
9.0
193,314
17,998

2,104
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 36,769 reviews of which 33,635 were positive and 3,134 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 702, this co-op game has secured the #3 spot in the ranking of free co-op games on Steam.
9.0
33,635
3,134

702
players

4. MultiVersus

MultiVersus is a free-to-play platform fighter that brings the depth of iconic WB stars to life across the nearly endless possibilities of play. MultiVersus is a multiplayer, 2d fighter and co-op game developed by Player First Games and published by Warner Bros. Games. Released on July 19th 2022 has received 117,993 reviews of which 90,334 were positive and 27,659 were negative resulting in a rating of 7.6 out of 10. Attracting a solid base of 358 players due to its free access, this strategy game has achieved the #4 position in the best free co-op games on Steam.
7.6
90,334
27,659

358
players

5. 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 27,729 reviews of which 25,576 were positive and 2,153 were negative resulting in an impressive rating of 9.0 out of 10. Attracting a solid base of 262 players due to its free access, this strategy game has achieved the #5 position in the best free co-op games on Steam.
9.0
25,576
2,153

262
players

6. 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 20,262 reviews of which 15,484 were positive and 4,778 were negative resulting in a rating of 7.5 out of 10. Attracting a solid base of 240 players due to its free access, this strategy game has achieved the #6 position in the best free co-op games on Steam.
7.5
15,484
4,778

240
players

7. 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 31,168 reviews of which 29,172 were positive and 1,996 were negative resulting in an impressive rating of 9.2 out of 10. Attracting a solid base of 206 players due to its free access, this strategy game has achieved the #7 position in the best free co-op games on Steam.
9.2
29,172
1,996

206
players

8. 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 29,594 reviews of which 26,712 were positive and 2,882 were negative resulting in a rating of 8.8 out of 10. Attracting a solid base of 142 players due to its free access, this strategy game has achieved the #8 position in the best free co-op games on Steam.
8.8
26,712
2,882

142
players

9. SAS: Zombie Assault 4

Purge the undead! Intense action-shooter with deep rpg elements, including upgradeable guns and armor, unique class skills, and class special abilities. Entire game can be played single player or as a 4-player online co-op game, including PvP events like Last Man Standing. SAS: Zombie Assault 4 is a free to play, zombies and multiplayer game developed and published by Ninja Kiwi. Released on October 16th 2017 has received 8,997 reviews of which 7,761 were positive and 1,236 were negative resulting in a rating of 8.4 out of 10. Attracting a solid base of 120 players due to its free access, this strategy game has achieved the #9 position in the best free co-op games on Steam.
8.4
7,761
1,236

120
players

10. 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 22,477 reviews of which 21,333 were positive and 1,144 were negative resulting in an impressive rating of 9.3 out of 10. The game currently holds the #10 spot among the most played free co-op games on Steam.
9.3
21,333
1,144

71
players