Best Online Co-Op Games on Steam
Steam currently has 5,098 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 5/1/2024.
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 1,281,484 reviews on Steam. This breaks down to a total of 1,251,095 positive reviews and 30,389 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 852,328 reviews on Steam. This breaks down to a total of 831,295 positive reviews and 21,033 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. 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 97, placing it in the #3 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 391,929 reviews on Steam. This breaks down to a total of 382,134 positive reviews and 9,795 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).
4. 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 #4 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 305,959 reviews on Steam. This breaks down to a total of 297,914 positive reviews and 8,045 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 |
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 1,064,929 reviews on Steam. This breaks down to a total of 1,030,157 positive reviews and 34,772 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 246,797 reviews on Steam. This breaks down to a total of 239,544 positive reviews and 7,253 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 604,571 reviews on Steam. This breaks down to a total of 585,098 positive reviews and 19,473 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 |
| Developer | Larian Studios |
| Publisher | Larian Studios |
| Steam App Id | 1086940 |
8. 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 #8 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 70,039 reviews on Steam. This breaks down to a total of 68,108 positive reviews and 1,931 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 |
9. PowerWash Simulator
Release the Pressure with PowerWash Simulator! Wash away your worries with the soothing sounds of high-pressure water. Fire up your power washer and blast away every speck of dirt and grime you can find, all with the simple satisfaction of power-washing to a sparkling finish.
PowerWash Simulator has achieved a Player Score of 95, placing it in the #9 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 43,460 reviews on Steam. This breaks down to a total of 42,306 positive reviews and 1,154 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $19.99 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 | $19.99 |
| Release Date | 7/14/2022 |
| Developer | FuturLab |
| Publisher | Square Enix |
| Steam App Id | 1290000 |
10. Risk of Rain 2
Escape a chaotic alien planet by fighting through hordes of frenzied monsters – with your friends, or on your own. Combine loot in surprising ways and master each character until you become the havoc you feared upon your first crash landing.
Risk of Rain 2 has achieved a Player Score of 95, placing it in the #10 spot for the best Online Co-Op games. Its score was calculated by analyzing a total of 270,635 reviews on Steam. This breaks down to a total of 260,625 positive reviews and 10,010 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $24.99 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 | $24.99 |
| Release Date | 8/11/2020 |
| Franchise | Risk of Rain Franchise |
| Developer | Hopoo Games |
| Publisher | Gearbox Publishing |
| Steam App Id | 632360 |
More Online Co-Op Games
Explore even more rankings for the 100 best Online Co-Op games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
 | 19,943 | 5/16/2011 | 97 | $9.99 | Steam Charts | |
 | 17,756 | 11/16/2009 | 97 | $9.99 | Steam Charts | |
 | 13,866 | 10/23/2023 | 97 | $9.99 | Steam Charts | |
 | 9,753 | 12/18/2018 | 96 | $13.99 | Steam Charts | |
 | 16,278 | 11/29/2006 | 96 | $9.99 | Steam Charts | |
 | 19,789 | 5/16/2020 | 96 | Free | Steam Charts | |
 | 63,766 | 8/3/2023 | 96 | $59.99 | Steam Charts | |
 | 89 | 5/15/2014 | 96 | $14.99 | Steam Charts | |
 | 1,690 | 7/14/2022 | 95 | $19.99 | Steam Charts | |
 | 6,868 | 8/11/2020 | 95 | $24.99 | Steam Charts | |
 | 9,272 | 9/18/2020 | 95 | $13.99 | Steam Charts | |
 | 60 | 5/31/2018 | 95 | $19.99 | Steam Charts | |
 | 186 | 7/27/2021 | 95 | $19.99 | Steam Charts | |
 | 406 | 11/17/2008 | 95 | $9.99 | Steam Charts | |
 | 588 | 7/8/2020 | 95 | $17.99 | Steam Charts | |
 | 6,175 | 6/5/2015 | 94 | $9.99 | Steam Charts | |
 | 296 | 7/26/2019 | 94 | $19.99 | Steam Charts | |
 | 1,565 | 1/27/2015 | 94 | $29.99 | Steam Charts | |
 | 137 | 11/17/2011 | 94 | $9.99 | Steam Charts | |
 | 2,653 | 9/20/2012 | 94 | $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. (2024, May 1). Steam Store. Steam Store.
- Valve Corporation. (2024, May 1). Terraria on Steam. Steam Store.
- Valve Corporation. (2024, April 23). Left 4 Dead 2 on Steam. Steam Store.
- Valve Corporation. (2024, April 16). Lethal Company on Steam. Steam Store.
- Valve Corporation. (2024, May 8). Bloons TD 6 on Steam. Steam Store.
- Valve Corporation. (2024, May 8). Garry's Mod on Steam. Steam Store.
- Valve Corporation. (2024, May 8). tModLoader on Steam. Steam Store.
- Valve Corporation. (2024, May 8). Baldur's Gate 3 on Steam. Steam Store.
- Valve Corporation. (2024, May 5). BattleBlock Theater® on Steam. Steam Store.
- Valve Corporation. (2024, May 8). PowerWash Simulator on Steam. Steam Store.
- Valve Corporation. (2024, May 8). Risk of Rain 2 on Steam. Steam Store.