Best Online Co-Op Games on Steam
Steam currently has 8,709 Online Co-Op games available to download and play. Explore our list of the best picks ranked by Player Score. Our Player Score rankings are calculated directly from reviews left on the Steam store and will be updated in real-time as more players leave their feedback. Online Co-Op game rankings were last updated on 2/12/2026.
Looking for more? Explore other lists such as:
- Free online co-op games on Steam
- Best online co-op Steam Deck games
- Best online co-op Linux games on Steam
- Best online co-op Steam games for Mac OS
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. 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 holds the #1 spot for "best Online Co-Op game on Steam" with a Player Score of 97. Its score was calculated by analyzing a total of 1,017,894 reviews on Steam. This breaks down to a total of 992,781 positive reviews and 25,113 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $9.99 to play and can be played and ran on both Windows and Linux systems. Valve has also verified it as playable on the Steam Deck and will run well.
2. Terraria
Dig, fight, explore, build! Nothing is impossible in this action-packed adventure game. Four Pack also available!
Terraria has achieved a Player Score of 97, placing it in the #2 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 1,498,721 reviews on Steam. This breaks down to a total of 1,459,859 positive reviews and 38,862 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $9.99 to play and can be played and ran on Windows, Mac, and Linux systems. Valve has also verified it as playable on the Steam Deck and will run well.
3. Bloons TD 6
The Bloons are back and better than ever! Get ready for a massive 3D tower defense game designed to give you hours and hours of the best strategy gaming available.
Bloons TD 6 has achieved a Player Score of 96, placing it in the #3 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 379,827 reviews on Steam. This breaks down to a total of 369,278 positive reviews and 10,549 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $13.99 to play and can be played and ran on both Windows and Mac systems. At the moment, it is possible to play Bloons TD 6 on the Steam Deck (though some functionality may be limited).
| Steam Price | $13.99 |
| Release Date | 12/18/2018 |
| Franchise | Ninja Kiwi Games |
| Developer | Ninja Kiwi |
| Publisher | Ninja Kiwi |
| Steam App Id | 960090 |
4. Garry's Mod
Garry's Mod is a physics sandbox. There aren't any predefined aims or goals. We give you the tools and leave you to play.
Garry's Mod has achieved a Player Score of 96, placing it in the #4 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 1,217,934 reviews on Steam. This breaks down to a total of 1,179,527 positive reviews and 38,407 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $4.99 to play and can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Garry's Mod on the Steam Deck (though some functionality may be limited).
| Steam Price | $4.99 |
| Release Date | 11/29/2006 |
| Developer | Facepunch Studios |
| Publisher | Valve |
| Steam App Id | 4000 |
5. Lethal Company
A co-op horror about scavenging at abandoned moons to sell scrap to the Company.
Lethal Company has achieved a Player Score of 96, placing it in the #5 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 502,551 reviews on Steam. This breaks down to a total of 487,759 positive reviews and 14,792 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $9.99 to play and can be played and ran on Windows systems. At the moment, it is possible to play Lethal Company on the Steam Deck (though some functionality may be limited).
6. 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 #6 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 357,067 reviews on Steam. This breaks down to a total of 346,823 positive reviews and 10,244 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is completely free to play and 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).
7. Baldur's Gate 3
Baldur’s Gate 3 is a story-rich, party-based RPG set in the universe of Dungeons & Dragons, where your choices shape a tale of fellowship and betrayal, survival and sacrifice, and the lure of absolute power.
Baldur's Gate 3 has achieved a Player Score of 96, placing it in the #7 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 825,932 reviews on Steam. This breaks down to a total of 799,603 positive reviews and 26,329 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $59.99 to play and can be played and ran on both Windows and Mac systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Steam Price | $59.99 |
| Release Date | 8/3/2023 |
| Franchise | Larian Studios |
| Developer | Larian Studios |
| Publisher | Larian Studios |
| Steam App Id | 1086940 |
8. WEBFISHING
WEBFISHING a multiplayer chatroom-focused fishing game! Relax and fish (on the web!)
WEBFISHING has achieved a Player Score of 96, placing it in the #8 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 69,467 reviews on Steam. This breaks down to a total of 67,750 positive reviews and 1,717 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $4.99 to play and can be played and ran on Windows systems. At the moment, it is not possible to play or run WEBFISHING on the Steam Deck.
| Steam Price | $4.99 |
| Release Date | 10/11/2024 |
| Developer | lamedeveloper |
| Publisher | lamedeveloper |
| Steam App Id | 3146520 |
9. Split Fiction
Embrace mind-blowing moments as you’re pulled deep into the many worlds of Split Fiction, a boundary-pushing co-op adventure.
Split Fiction has achieved a Player Score of 96, placing it in the #9 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 114,269 reviews on Steam. This breaks down to a total of 111,113 positive reviews and 3,156 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $49.99 to play and can be played and ran on Windows systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Steam Price | $49.99 |
| Release Date | 3/6/2025 |
| Franchise | Electronic Arts |
| Developer | Hazelight Studios |
| Publisher | Electronic Arts |
| Steam App Id | 2001120 |
10. BattleBlock Theater®
Welcome to BattleBlock Theater! You’ve got no where to go but up...on stage. Play single player or co-op to free your friends and save Hatty Hattington! Jump, solve and battle your way through a mysterious theater inhabited by highly technological felines.
BattleBlock Theater® has achieved a Player Score of 96, placing it in the #10 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 72,295 reviews on Steam. This breaks down to a total of 70,279 positive reviews and 2,016 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $14.99 to play and can be played and ran on Windows, Mac, and Linux systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Steam Price | $14.99 |
| Release Date | 5/15/2014 |
| Franchise | The Behemoth |
| Developer | The Behemoth |
| Publisher | The Behemoth |
| Steam App Id | 238460 |
More Online Co-Op Games
Explore even more rankings for the 100 best Online Co-Op games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 14,675 | 11/16/2009 | 97 | $9.99 | Steam Charts | |
| 64,273 | 5/16/2011 | 97 | $9.99 | Steam Charts | |
| 6,517 | 12/18/2018 | 96 | $13.99 | Steam Charts | |
| 18,844 | 11/29/2006 | 96 | $4.99 | Steam Charts | |
| 2,254 | 10/23/2023 | 96 | $9.99 | Steam Charts | |
| 43,767 | 5/16/2020 | 96 | Free | Steam Charts | |
| 31,512 | 8/3/2023 | 96 | $59.99 | Steam Charts | |
| 139 | 10/11/2024 | 96 | $4.99 | Steam Charts | |
| 6,829 | 3/6/2025 | 96 | $49.99 | Steam Charts | |
| 80 | 5/15/2014 | 96 | $14.99 | Steam Charts | |
 | 86 | 5/31/2018 | 95 | $11.99 | Steam Charts | |
 | 16,809 | 2/26/2025 | 95 | $9.99 | Steam Charts | |
 | 164 | 7/6/2022 | 95 | $1.99 | Steam Charts | |
 | 506 | 9/18/2025 | 95 | $24.99 | Steam Charts | |
 | 257 | 2/15/2024 | 95 | $29.99 | Steam Charts | |
 | 129 | 11/16/2023 | 95 | $9.99 | Steam Charts | |
 | 6,156 | 9/18/2020 | 95 | $19.99 | Steam Charts | |
 | 1,923 | 9/15/2024 | 95 | $12.99 | Steam Charts | |
 | 344 | 7/22/2025 | 95 | $29.99 | Steam Charts | |
 | 9 | 9/17/2025 | 95 | $4.99 | Steam Charts |
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Reviews 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, February 12). Steam Store. Steam Store.
- Valve Corporation. (2026, February 12). Left 4 Dead 2 on Steam. Steam Store.
- Valve Corporation. (2026, February 18). Terraria on Steam. Steam Store.
- Valve Corporation. (2026, February 23). Bloons TD 6 on Steam. Steam Store.
- Valve Corporation. (2026, February 23). Garry's Mod on Steam. Steam Store.
- Valve Corporation. (2026, February 24). Lethal Company on Steam. Steam Store.
- Valve Corporation. (2026, February 12). tModLoader on Steam. Steam Store.
- Valve Corporation. (2026, February 24). Baldur's Gate 3 on Steam. Steam Store.
- Valve Corporation. (2026, February 19). WEBFISHING on Steam. Steam Store.
- Valve Corporation. (2026, February 20). Split Fiction on Steam. Steam Store.
- Valve Corporation. (2026, February 18). BattleBlock Theater® on Steam. Steam Store.