Best Online Co-Op Games on Steam
Steam currently has 8,142 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 11/4/2025.
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. 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 998,398 reviews on Steam. This breaks down to a total of 973,768 positive reviews and 24,630 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 1,451,810 reviews on Steam. This breaks down to a total of 1,414,630 positive reviews and 37,180 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 369,146 reviews on Steam. This breaks down to a total of 358,860 positive reviews and 10,286 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. 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 496,331 reviews on Steam. This breaks down to a total of 481,892 positive reviews and 14,439 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. 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 #5 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 1,189,610 reviews on Steam. This breaks down to a total of 1,151,665 positive reviews and 37,945 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. At the moment, it is possible to play Garry's Mod on the Steam Deck (though some functionality may be limited).
| Steam Price | $9.99 |
| Release Date | 11/29/2006 |
| Developer | Facepunch Studios |
| Publisher | Valve |
| Steam App Id | 4000 |
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 335,338 reviews on Steam. This breaks down to a total of 325,591 positive reviews and 9,747 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 795,051 reviews on Steam. This breaks down to a total of 769,917 positive reviews and 25,134 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 68,445 reviews on Steam. This breaks down to a total of 66,885 positive reviews and 1,560 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 96,211 reviews on Steam. This breaks down to a total of 93,536 positive reviews and 2,675 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 72,001 reviews on Steam. This breaks down to a total of 69,994 positive reviews and 2,007 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 | ||||
|---|---|---|---|---|---|---|
| 15,843 | 11/16/2009 | 97 | $9.99 | Steam Charts | |
| 20,852 | 5/16/2011 | 97 | $9.99 | Steam Charts | |
| 8,060 | 12/18/2018 | 96 | $13.99 | Steam Charts | |
| 2,868 | 10/23/2023 | 96 | $9.99 | Steam Charts | |
| 20,048 | 11/29/2006 | 96 | $9.99 | Steam Charts | |
| 23,935 | 5/16/2020 | 96 | Free | Steam Charts | |
| 39,737 | 8/3/2023 | 96 | $59.99 | Steam Charts | |
| 262 | 10/11/2024 | 96 | $4.99 | Steam Charts | |
| 2,850 | 3/6/2025 | 96 | $49.99 | Steam Charts | |
| 57 | 5/15/2014 | 96 | $14.99 | Steam Charts | |
 | 42 | 5/31/2018 | 95 | $19.99 | Steam Charts | |
 | 1,071 | 2/15/2024 | 95 | $11.99 | Steam Charts | |
 | 900 | 9/18/2025 | 95 | $24.99 | Steam Charts | |
 | 80 | 11/16/2023 | 95 | $9.99 | Steam Charts | |
 | 12,012 | 9/18/2020 | 95 | $19.99 | Steam Charts | |
 | 390 | 7/22/2025 | 95 | $29.99 | Steam Charts | |
 | 2,142 | 9/15/2024 | 95 | $12.99 | Steam Charts | |
 | 214 | 7/27/2021 | 95 | $19.99 | Steam Charts | |
 | 1,815 | 7/14/2022 | 95 | $24.99 | Steam Charts | |
 | 224 | 11/17/2008 | 95 | $9.99 | 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, November 4). Steam Store. Steam Store.
- Valve Corporation. (2025, November 4). Left 4 Dead 2 on Steam. Steam Store.
- Valve Corporation. (2025, November 18). Terraria on Steam. Steam Store.
- Valve Corporation. (2025, November 19). Bloons TD 6 on Steam. Steam Store.
- Valve Corporation. (2025, November 19). Lethal Company on Steam. Steam Store.
- Valve Corporation. (2025, November 19). Garry's Mod on Steam. Steam Store.
- Valve Corporation. (2025, November 13). tModLoader on Steam. Steam Store.
- Valve Corporation. (2025, November 11). Baldur's Gate 3 on Steam. Steam Store.
- Valve Corporation. (2025, October 6). WEBFISHING on Steam. Steam Store.
- Valve Corporation. (2025, November 18). Split Fiction on Steam. Steam Store.
- Valve Corporation. (2025, November 14). BattleBlock Theater® on Steam. Steam Store.