Free Online Co-Op Games on Steam
Steam currently has 8,353 Online Co-Op games available to download and play. Explore our list of the best free games ranked by popularity and ratings. Data for this list is calculated from reviews and player counts reported directly by Steam and will be updated in real-time. Free Online Co-Op game rankings were last updated on 12/14/2025.
Looking for more? Explore other lists such as:
- Best online co-op games on Steam
- Best online co-op Steam Deck games
- Best online co-op Steam games for Mac OS
- Best online co-op Linux games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. Counter-Strike 2
For over two decades, Counter-Strike has offered an elite competitive experience, one shaped by millions of players from across the globe. And now the next chapter in the CS story is about to begin. This is Counter-Strike 2.
Counter-Strike 2 holds the #1 spot for "best free Online Co-Op game on Steam" with a Player Score of 86. Its score was calculated by analyzing a total of 9,230,784 reviews on Steam. This breaks down to a total of 7,970,361 positive reviews and 1,260,423 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on both Windows and Linux systems. At the moment, it is possible to play Counter-Strike 2 on the Steam Deck (though some functionality may be limited).
2. Dota 2
Every day, millions of players worldwide enter battle as one of over a hundred Dota heroes. And no matter if it's their 10th hour of play or 1,000th, there's always something new to discover. With regular updates that ensure a constant evolution of gameplay, features, and heroes, Dota 2 has taken on a life of its own.
Dota 2 has achieved a Player Score of 81, placing it in the #2 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 2,636,364 reviews on Steam. This breaks down to a total of 2,143,550 positive reviews and 492,814 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Dota 2 on the Steam Deck (though some functionality may be limited).
3. PUBG: BATTLEGROUNDS
PUBG: BATTLEGROUNDS, the high-stakes winner-take-all shooter that started the Battle Royale craze, is free-to-play! Drop into diverse maps, loot unique weapons and supplies, and survive in an ever-shrinking zone where every turn could be your last.
PUBG: BATTLEGROUNDS has achieved a Player Score of 60, placing it in the #3 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 2,644,996 reviews on Steam. This breaks down to a total of 1,583,878 positive reviews and 1,061,118 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run PUBG: BATTLEGROUNDS on the Steam Deck.
| Release Date | 12/21/2017 |
| Franchise | KRAFTON, Inc. |
| Developers | |
| Publisher | KRAFTON, Inc. |
| Steam App Id | 578080 |
4. Warframe
Awaken as an unstoppable warrior and battle alongside your friends in this story-driven free-to-play online action game
Warframe has achieved a Player Score of 87, placing it in the #4 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 642,025 reviews on Steam. This breaks down to a total of 561,698 positive reviews and 80,327 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Release Date | 3/25/2013 |
| Developer | Digital Extremes |
| Publisher | Digital Extremes |
| Steam App Id | 230410 |
5. Marvel Rivals
Marvel Rivals is a Super Hero Team-Based PVP Shooter! Assemble an all-star Marvel squad, devise countless strategies by combining powers to form unique Team-Up skills and fight in destructible, ever-changing battlefields across the continually evolving Marvel universe!
Marvel Rivals has achieved a Player Score of 77, placing it in the #5 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 350,880 reviews on Steam. This breaks down to a total of 271,891 positive reviews and 78,989 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Marvel Rivals on the Steam Deck (though some functionality may be limited).
| Release Date | 12/6/2024 |
| Developer | NetEase Games |
| Publisher | NetEase Games |
| Steam App Id | 2767030 |
6. Where Winds Meet
Where Winds Meet is an epic Wuxia open-world action-adventure RPG set in ancient China at the tenth century. Players will assume the role of a young sword master as they embark on a journey to uncover the mysteries of their own identity. Let the wind carry your legend on an epic journey to the East!
Where Winds Meet has achieved a Player Score of 88, placing it in the #6 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 85,318 reviews on Steam. This breaks down to a total of 75,757 positive reviews and 9,561 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run Where Winds Meet on the Steam Deck.
| Release Date | 11/14/2025 |
| Developer | Everstone Studio |
| Publisher | NetEase Games |
| Steam App Id | 3564740 |
7. Team Fortress 2
Nine distinct classes provide a broad range of tactical abilities and personalities. Constantly updated with new game modes, maps, equipment and, most importantly, hats!
Team Fortress 2 has achieved a Player Score of 90, placing it in the #7 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 1,206,065 reviews on Steam. This breaks down to a total of 1,092,976 positive reviews and 113,089 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on both Windows and Linux systems. At the moment, it is possible to play Team Fortress 2 on the Steam Deck (though some functionality may be limited).
8. Tom Clancy's Rainbow Six® Siege X
Rainbow Six Siege X is the reference in tactical team shooters, where elite strategy and execution triumph. Enjoy free access to Quick Match, Unranked and Dual Front game modes with a selection of operators.
Tom Clancy's Rainbow Six® Siege X has achieved a Player Score of 82, placing it in the #8 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 1,462,863 reviews on Steam. This breaks down to a total of 1,211,193 positive reviews and 251,670 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run Tom Clancy's Rainbow Six® Siege X on the Steam Deck.
| Release Date | 12/1/2015 |
| Franchise | Tom Clancy Franchise |
| Developer | Ubisoft Montreal |
| Publisher | Ubisoft |
| Steam App Id | 359550 |
9. Overwatch® 2
Overwatch 2 is a critically acclaimed, team-based shooter game set in an optimistic future with an evolving roster of heroes. Team up with friends and jump in today.
Overwatch® 2 has achieved a Player Score of 26, placing it in the #9 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 363,579 reviews on Steam. This breaks down to a total of 94,376 positive reviews and 269,203 negative reviews — making it "Mostly Negative" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Overwatch® 2 on the Steam Deck (though some functionality may be limited).
| Release Date | 8/10/2023 |
| Franchise | Blizzard |
| Developer | Blizzard Entertainment, Inc. |
| Publisher | Blizzard Entertainment, Inc. |
| Steam App Id | 2357570 |
10. 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 has achieved a Player Score of 76, placing it in the #10 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 151,602 reviews on Steam. This breaks down to a total of 116,378 positive reviews and 35,224 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play World of Warships on the Steam Deck (though some functionality may be limited).
| Release Date | 11/15/2017 |
| Franchise | World of Warships Franchise |
| Developer | Wargaming Group Limited |
| Publisher | Wargaming Group Limited |
| Steam App Id | 552990 |
More Free Online Co-Op Games
Explore even more rankings for the 100 best free Online Co-Op games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 748,109 | 8/21/2012 | 86 | Free | Steam Charts | |
| 297,610 | 7/9/2013 | 81 | Free | Steam Charts | |
| 95,193 | 12/21/2017 | 60 | Free | Steam Charts | |
| 95,073 | 3/25/2013 | 87 | Free | Steam Charts | |
| 76,862 | 12/6/2024 | 77 | Free | Steam Charts | |
| 67,721 | 11/14/2025 | 88 | Free | Steam Charts | |
| 46,811 | 10/10/2007 | 90 | Free | Steam Charts | |
| 40,432 | 12/1/2015 | 82 | Free | Steam Charts | |
| 32,666 | 8/10/2023 | 26 | Free | Steam Charts | |
| 27,856 | 11/15/2017 | 76 | Free | Steam Charts | |
 | 24,419 | 12/4/2024 | 58 | Free | Steam Charts | |
 | 19,271 | 5/16/2020 | 96 | Free | Steam Charts | |
 | 15,210 | 12/8/2023 | 78 | Free | Steam Charts | |
 | 12,978 | 10/17/2017 | 80 | Free | Steam Charts | |
 | 12,676 | 9/30/2021 | 50 | Free | Steam Charts | |
 | 10,101 | 10/23/2013 | 88 | Free | Steam Charts | |
 | 9,421 | 7/9/2024 | 76 | Free | Steam Charts | |
 | 8,835 | 7/17/2025 | 54 | Free | Steam Charts | |
 | 8,095 | 3/25/2024 | 85 | Free | Steam Charts | |
 | 5,880 | 9/16/2025 | 70 | Free | Steam Charts |
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Player counts and rankings are enriched, analyzed, and updated in real-time to ensure we surface the most up-to-date insights. Learn more about the Steambase approach to data collection and our review methodology.
- Valve Corporation. (2025, December 14). Steam Store. Steam Store.
- Valve Corporation. (2025, December 14). Counter-Strike 2 on Steam. Steam Store.
- Valve Corporation. (2025, December 16). Dota 2 on Steam. Steam Store.
- Valve Corporation. (2025, December 10). PUBG: BATTLEGROUNDS on Steam. Steam Store.
- Valve Corporation. (2025, December 14). Warframe on Steam. Steam Store.
- Valve Corporation. (2025, December 16). Marvel Rivals on Steam. Steam Store.
- Valve Corporation. (2025, December 13). Where Winds Meet on Steam. Steam Store.
- Valve Corporation. (2025, December 16). Team Fortress 2 on Steam. Steam Store.
- Valve Corporation. (2025, December 16). Tom Clancy's Rainbow Six® Siege X on Steam. Steam Store.
- Valve Corporation. (2025, December 11). Overwatch® 2 on Steam. Steam Store.
- Valve Corporation. (2025, December 16). World of Warships on Steam. Steam Store.