Best Online Co-Op Games on Steam
Steam currently has 7,166 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 5/16/2025.
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. Terraria
Dig, fight, explore, build! Nothing is impossible in this action-packed adventure game. Four Pack also available!
Terraria 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 1,407,420 reviews on Steam. This breaks down to a total of 1,371,995 positive reviews and 35,425 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.
2. 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 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 961,839 reviews on Steam. This breaks down to a total of 938,126 positive reviews and 23,713 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $0.99 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.
3. 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 #3 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 65,664 reviews on Steam. This breaks down to a total of 64,337 positive reviews and 1,327 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 |
4. 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 #4 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 486,554 reviews on Steam. This breaks down to a total of 472,879 positive reviews and 13,675 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).
5. 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 #5 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 353,805 reviews on Steam. This breaks down to a total of 344,122 positive reviews and 9,683 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 |
6. 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 #6 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 1,157,995 reviews on Steam. This breaks down to a total of 1,120,897 positive reviews and 37,098 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $5.99 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 | $5.99 |
| Release Date | 11/29/2006 |
| Developer | Facepunch Studios |
| Publisher | Valve |
| Steam App Id | 4000 |
7. 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 #7 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 312,956 reviews on Steam. This breaks down to a total of 303,915 positive reviews and 9,041 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).
8. 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 #8 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 758,748 reviews on Steam. This breaks down to a total of 734,846 positive reviews and 23,902 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 |
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 80,685 reviews on Steam. This breaks down to a total of 78,722 positive reviews and 1,963 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 71,589 reviews on Steam. This breaks down to a total of 69,592 positive reviews and 1,997 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 | ||||
|---|---|---|---|---|---|---|
| 25,055 | 5/16/2011 | 97 | $9.99 | Steam Charts | |
| 44,866 | 11/16/2009 | 97 | $0.99 | Steam Charts | |
| 878 | 10/11/2024 | 96 | $4.99 | Steam Charts | |
| 4,899 | 10/23/2023 | 96 | $9.99 | Steam Charts | |
| 7,963 | 12/18/2018 | 96 | $13.99 | Steam Charts | |
| 17,619 | 11/29/2006 | 96 | $5.99 | Steam Charts | |
| 27,578 | 5/16/2020 | 96 | Free | Steam Charts | |
| 74,205 | 8/3/2023 | 96 | $59.99 | Steam Charts | |
| 5,705 | 3/6/2025 | 96 | $49.99 | Steam Charts | |
| 105 | 5/15/2014 | 96 | $14.99 | Steam Charts | |
 | 65,372 | 2/26/2025 | 95 | $9.99 | Steam Charts | |
 | 1,830 | 9/15/2024 | 95 | $12.99 | Steam Charts | |
 | 193 | 5/31/2018 | 95 | $19.99 | Steam Charts | |
 | 3,674 | 7/14/2022 | 95 | $24.99 | Steam Charts | |
 | 12,676 | 9/18/2020 | 95 | $19.99 | Steam Charts | |
 | 241 | 2/15/2024 | 95 | $29.99 | Steam Charts | |
 | 725 | 7/26/2019 | 95 | $19.99 | Steam Charts | |
 | 742 | 11/16/2023 | 95 | $9.99 | Steam Charts | |
 | 683 | 7/8/2020 | 95 | $17.99 | Steam Charts | |
 | 188 | 7/27/2021 | 95 | $19.99 | 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. (2025, May 16). Steam Store. Steam Store.
- Valve Corporation. (2025, May 16). Terraria on Steam. Steam Store.
- Valve Corporation. (2025, May 27). Left 4 Dead 2 on Steam. Steam Store.
- Valve Corporation. (2025, May 21). WEBFISHING on Steam. Steam Store.
- Valve Corporation. (2025, May 31). Lethal Company on Steam. Steam Store.
- Valve Corporation. (2025, May 30). Bloons TD 6 on Steam. Steam Store.
- Valve Corporation. (2025, May 30). Garry's Mod on Steam. Steam Store.
- Valve Corporation. (2025, May 29). tModLoader on Steam. Steam Store.
- Valve Corporation. (2025, May 29). Baldur's Gate 3 on Steam. Steam Store.
- Valve Corporation. (2025, May 31). Split Fiction on Steam. Steam Store.
- Valve Corporation. (2025, May 30). BattleBlock Theater® on Steam. Steam Store.