Free Online Co-Op Games on Steam
Steam currently has 7,820 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 9/29/2025.
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 9,049,371 reviews on Steam. This breaks down to a total of 7,821,144 positive reviews and 1,228,227 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 2,565,024 reviews on Steam. This breaks down to a total of 2,086,835 positive reviews and 478,189 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 2,610,541 reviews on Steam. This breaks down to a total of 1,557,697 positive reviews and 1,052,844 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. skate.
Experience improved Flick-It controls, the rich physics based skateboarding gameplay that provides those “only in skate.™“ moments and off-board exploration for full freedom in the online multiplayer world of San Vansterdam.
skate. has achieved a Player Score of 67, placing it in the #4 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 37,020 reviews on Steam. This breaks down to a total of 25,179 positive reviews and 11,841 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 skate. on the Steam Deck.
| Release Date | 9/16/2025 |
| Franchise | Electronic Arts |
| Developer | Full Circle |
| Publisher | Electronic Arts |
| Steam App Id | 3354750 |
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 319,550 reviews on Steam. This breaks down to a total of 246,784 positive reviews and 72,766 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. Delta Force
Delta Force, a free-to-play 1st-person tactical shooter, returns as the latest in the classic series. With 25 years defining the genre, Delta Force is back with an upgraded arsenal of weaponry, jaw-dropping environments, and a truly dynamic world.
Delta Force has achieved a Player Score of 60, placing it in the #6 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 143,038 reviews on Steam. This breaks down to a total of 86,722 positive reviews and 56,316 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 Delta Force on the Steam Deck.
| Release Date | 12/4/2024 |
| Developers | |
| Publisher | TiMi Studio Group |
| Steam App Id | 2507950 |
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 1,182,519 reviews on Steam. This breaks down to a total of 1,068,467 positive reviews and 114,052 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 83, placing it in the #8 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 1,447,752 reviews on Steam. This breaks down to a total of 1,201,612 positive reviews and 246,140 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 |
| Developer | Ubisoft Montreal |
| Publisher | Ubisoft |
| Steam App Id | 359550 |
9. 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 #9 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 631,556 reviews on Steam. This breaks down to a total of 552,671 positive reviews and 78,885 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 |
10. 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 #10 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 355,262 reviews on Steam. This breaks down to a total of 89,152 positive reviews and 266,110 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 |
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 | ||||
|---|---|---|---|---|---|---|
| 761,601 | 8/21/2012 | 86 | Free | Steam Charts | |
| 499,309 | 7/9/2013 | 81 | Free | Steam Charts | |
| 110,868 | 12/21/2017 | 60 | Free | Steam Charts | |
| 72,377 | 9/16/2025 | 67 | Free | Steam Charts | |
| 69,085 | 12/6/2024 | 77 | Free | Steam Charts | |
| 48,870 | 12/4/2024 | 60 | Free | Steam Charts | |
| 46,554 | 10/10/2007 | 90 | Free | Steam Charts | |
| 42,276 | 12/1/2015 | 83 | Free | Steam Charts | |
| 32,995 | 3/25/2013 | 87 | Free | Steam Charts | |
| 28,622 | 8/10/2023 | 26 | Free | Steam Charts | |
 | 18,381 | 7/9/2024 | 75 | Free | Steam Charts | |
 | 16,004 | 12/7/2023 | 77 | Free | Steam Charts | |
 | 14,223 | 5/16/2020 | 96 | Free | Steam Charts | |
 | 13,035 | 9/29/2021 | 49 | Free | Steam Charts | |
 | 10,577 | 6/7/2024 | 64 | Free | Steam Charts | |
 | 10,510 | 10/17/2017 | 80 | Free | Steam Charts | |
 | 9,952 | 3/25/2024 | 84 | Free | Steam Charts | |
 | 8,659 | 7/17/2025 | 56 | Free | Steam Charts | |
 | 5,671 | 11/15/2017 | 76 | Free | Steam Charts | |
 | 5,456 | 9/10/2025 | 60 | 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, September 29). Steam Store. Steam Store.
- Valve Corporation. (2025, September 29). Counter-Strike 2 on Steam. Steam Store.
- Valve Corporation. (2025, September 27). Dota 2 on Steam. Steam Store.
- Valve Corporation. (2025, September 18). PUBG: BATTLEGROUNDS on Steam. Steam Store.
- Valve Corporation. (2025, September 29). skate. on Steam. Steam Store.
- Valve Corporation. (2025, September 25). Marvel Rivals on Steam. Steam Store.
- Valve Corporation. (2025, September 29). Delta Force on Steam. Steam Store.
- Valve Corporation. (2025, September 27). Team Fortress 2 on Steam. Steam Store.
- Valve Corporation. (2025, September 29). Tom Clancy's Rainbow Six® Siege X on Steam. Steam Store.
- Valve Corporation. (2025, September 20). Warframe on Steam. Steam Store.
- Valve Corporation. (2025, September 29). Overwatch® 2 on Steam. Steam Store.