Free Online Co-Op Games on Steam
Steam currently has 7,282 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 6/23/2025.
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 8,848,905 reviews on Steam. This breaks down to a total of 7,668,732 positive reviews and 1,180,173 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. 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 59, placing it in the #2 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 2,566,987 reviews on Steam. This breaks down to a total of 1,526,382 positive reviews and 1,040,605 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 |
3. 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 #3 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 2,509,209 reviews on Steam. This breaks down to a total of 2,044,585 positive reviews and 464,624 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).
4. 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 63, placing it in the #4 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 117,122 reviews on Steam. This breaks down to a total of 73,982 positive reviews and 43,140 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 |
5. 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 #5 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 1,413,278 reviews on Steam. This breaks down to a total of 1,179,689 positive reviews and 233,589 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 |
6. Path of Exile
You are an Exile, struggling to survive on the dark continent of Wraeclast, as you fight to earn power that will allow you to exact your revenge against those who wronged you. Path of Exile is an online Action RPG set in a dark fantasy world. The game is completely free and will never be pay-to-win.
Path of Exile 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 237,372 reviews on Steam. This breaks down to a total of 210,825 positive reviews and 26,547 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, it is possible to play Path of Exile on the Steam Deck (though some functionality may be limited).
| Release Date | 10/23/2013 |
| Developer | Grinding Gear Games |
| Publisher | Grinding Gear Games |
| Steam App Id | 238960 |
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 89, placing it in the #7 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 1,164,854 reviews on Steam. This breaks down to a total of 1,048,159 positive reviews and 116,695 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. 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 78, placing it in the #8 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 293,383 reviews on Steam. This breaks down to a total of 232,203 positive reviews and 61,180 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 |
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 621,785 reviews on Steam. This breaks down to a total of 543,647 positive reviews and 78,138 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. tModLoader
Dig, Fight, and Build your way through the world of player-created mods on Terraria with tModLoader - this DLC makes modding Terraria a reality!
tModLoader has achieved a Player Score of 96, placing it in the #10 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 316,428 reviews on Steam. This breaks down to a total of 307,280 positive reviews and 9,148 negative reviews — making it "Overwhelmingly Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play tModLoader on the Steam Deck (though some functionality may be limited).
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 | ||||
|---|---|---|---|---|---|---|
| 1,179,515 | 8/21/2012 | 86 | Free | Steam Charts | |
| 528,180 | 12/21/2017 | 59 | Free | Steam Charts | |
| 444,734 | 7/9/2013 | 81 | Free | Steam Charts | |
| 123,690 | 12/4/2024 | 63 | Free | Steam Charts | |
| 76,115 | 12/1/2015 | 83 | Free | Steam Charts | |
| 70,058 | 10/23/2013 | 88 | Free | Steam Charts | |
| 47,074 | 10/10/2007 | 89 | Free | Steam Charts | |
| 41,407 | 12/6/2024 | 78 | Free | Steam Charts | |
| 38,569 | 3/25/2013 | 87 | Free | Steam Charts | |
| 30,626 | 5/16/2020 | 96 | Free | Steam Charts | |
 | 29,156 | 7/9/2024 | 73 | Free | Steam Charts | |
 | 23,711 | 8/10/2023 | 25 | Free | Steam Charts | |
 | 12,563 | 12/8/2023 | 77 | Free | Steam Charts | |
 | 11,592 | 9/30/2021 | 48 | Free | Steam Charts | |
 | 8,834 | 11/15/2017 | 76 | Free | Steam Charts | |
 | 8,121 | 10/17/2017 | 81 | Free | Steam Charts | |
 | 7,460 | 6/30/2024 | 56 | Free | Steam Charts | |
 | 7,297 | 11/9/2016 | 78 | Free | Steam Charts | |
 | 7,224 | 3/25/2024 | 84 | Free | Steam Charts | |
 | 7,020 | 10/3/2021 | 85 | 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, June 23). Steam Store. Steam Store.
- Valve Corporation. (2025, June 23). Counter-Strike 2 on Steam. Steam Store.
- Valve Corporation. (2025, June 23). PUBG: BATTLEGROUNDS on Steam. Steam Store.
- Valve Corporation. (2025, June 24). Dota 2 on Steam. Steam Store.
- Valve Corporation. (2025, June 24). Delta Force on Steam. Steam Store.
- Valve Corporation. (2025, June 24). Tom Clancy's Rainbow Six® Siege X on Steam. Steam Store.
- Valve Corporation. (2025, June 23). Path of Exile on Steam. Steam Store.
- Valve Corporation. (2025, June 20). Team Fortress 2 on Steam. Steam Store.
- Valve Corporation. (2025, June 23). Marvel Rivals on Steam. Steam Store.
- Valve Corporation. (2025, June 14). Warframe on Steam. Steam Store.
- Valve Corporation. (2025, June 24). tModLoader on Steam. Steam Store.