Free Online Co-Op Games on Steam
Steam currently has 8,473 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 1/8/2026.
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 9,289,458 reviews on Steam. This breaks down to a total of 8,020,101 positive reviews and 1,269,357 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 2,650,160 reviews on Steam. This breaks down to a total of 2,153,181 positive reviews and 496,979 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 2,657,607 reviews on Steam. This breaks down to a total of 1,593,754 positive reviews and 1,063,853 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. 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 58, placing it in the #4 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 167,538 reviews on Steam. This breaks down to a total of 98,210 positive reviews and 69,328 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. 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 #5 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 646,352 reviews on Steam. This breaks down to a total of 565,884 positive reviews and 80,468 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 |
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 87, placing it in the #6 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 94,223 reviews on Steam. This breaks down to a total of 83,290 positive reviews and 10,933 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 1,210,362 reviews on Steam. This breaks down to a total of 1,097,572 positive reviews and 112,790 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 77, placing it in the #8 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 356,837 reviews on Steam. This breaks down to a total of 276,198 positive reviews and 80,639 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. 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 #9 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 348,354 reviews on Steam. This breaks down to a total of 338,359 positive reviews and 9,995 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).
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 152,114 reviews on Steam. This breaks down to a total of 116,765 positive reviews and 35,349 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 | ||||
|---|---|---|---|---|---|---|
| 1,066,151 | 8/21/2012 | 86 | Free | Steam Charts | |
| 605,594 | 7/9/2013 | 81 | Free | Steam Charts | |
| 421,779 | 12/21/2017 | 60 | Free | Steam Charts | |
| 96,987 | 12/4/2024 | 58 | Free | Steam Charts | |
| 82,431 | 3/25/2013 | 87 | Free | Steam Charts | |
| 66,941 | 11/14/2025 | 87 | Free | Steam Charts | |
| 56,318 | 10/10/2007 | 90 | Free | Steam Charts | |
| 46,992 | 12/6/2024 | 77 | Free | Steam Charts | |
| 36,243 | 5/16/2020 | 96 | Free | Steam Charts | |
| 32,466 | 11/15/2017 | 76 | Free | Steam Charts | |
 | 32,169 | 12/1/2015 | 82 | Free | Steam Charts | |
 | 21,890 | 8/10/2023 | 27 | Free | Steam Charts | |
 | 15,162 | 7/9/2024 | 76 | Free | Steam Charts | |
 | 12,629 | 9/30/2021 | 50 | Free | Steam Charts | |
 | 8,778 | 12/8/2023 | 78 | Free | Steam Charts | |
 | 8,241 | 11/9/2016 | 77 | Free | Steam Charts | |
 | 8,238 | 10/23/2013 | 88 | Free | Steam Charts | |
 | 7,194 | 10/3/2021 | 85 | Free | Steam Charts | |
 | 6,205 | 7/17/2025 | 54 | Free | Steam Charts | |
 | 6,175 | 12/29/2017 | 90 | 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. (2026, January 8). Steam Store. Steam Store.
- Valve Corporation. (2026, January 8). Counter-Strike 2 on Steam. Steam Store.
- Valve Corporation. (2026, January 8). Dota 2 on Steam. Steam Store.
- Valve Corporation. (2026, January 9). PUBG: BATTLEGROUNDS on Steam. Steam Store.
- Valve Corporation. (2026, January 11). Delta Force on Steam. Steam Store.
- Valve Corporation. (2026, January 7). Warframe on Steam. Steam Store.
- Valve Corporation. (2026, January 11). Where Winds Meet on Steam. Steam Store.
- Valve Corporation. (2026, January 6). Team Fortress 2 on Steam. Steam Store.
- Valve Corporation. (2026, January 11). Marvel Rivals on Steam. Steam Store.
- Valve Corporation. (2026, January 9). tModLoader on Steam. Steam Store.
- Valve Corporation. (2026, January 6). World of Warships on Steam. Steam Store.