Best Online Co-Op Games on Steam

Steam currently has 7,039 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 3/25/2025.

Looking for more? Explore other lists such as:

1. Terraria

Dig, fight, explore, build! Nothing is impossible in this action-packed adventure game. Four Pack also available!

Terraria banner

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 1,402,194 reviews on Steam. This breaks down to a total of 1,366,926 positive reviews and 35,268 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.

Steam Price $9.99
Release Date 5/16/2011
Developer Re-Logic
Publisher Re-Logic
Steam App Id 105600

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 banner

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 957,674 reviews on Steam. This breaks down to a total of 934,062 positive reviews and 23,612 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.

Steam Price $9.99
Release Date 11/16/2009
Developer Valve
Publisher Valve
Steam App Id 550

3. WEBFISHING

WEBFISHING a multiplayer chatroom-focused fishing game! Relax and fish (on the web!)

WEBFISHING banner

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 65,188 reviews on Steam. This breaks down to a total of 63,908 positive reviews and 1,280 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 banner

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 485,666 reviews on Steam. This breaks down to a total of 472,082 positive reviews and 13,584 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).

Steam Price $9.99
Release Date 10/23/2023
Developer Zeekerss
Publisher Zeekerss
Steam App Id 1966720

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 banner

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 352,470 reviews on Steam. This breaks down to a total of 342,847 positive reviews and 9,623 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 banner

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 1,154,821 reviews on Steam. This breaks down to a total of 1,117,792 positive reviews and 37,029 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

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 banner

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 310,476 reviews on Steam. This breaks down to a total of 301,504 positive reviews and 8,972 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).

Release Date 5/16/2020
Developer TML Team
Publishers
Steam App Id 1281930

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 banner

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 753,543 reviews on Steam. This breaks down to a total of 729,781 positive reviews and 23,762 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 banner

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 76,890 reviews on Steam. This breaks down to a total of 75,090 positive reviews and 1,800 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® banner

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 71,538 reviews on Steam. This breaks down to a total of 69,541 positive reviews and 1,997 negative reviews — making it "Overwhelmingly Positive" on Steam.

It is priced at $4.49 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 $4.49
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.

ImageName
Actions
Terraria steam charts
34,289
5/16/2011
97
$9.99
Steam Charts
Left 4 Dead 2 steam charts
27,185
11/16/2009
97
$9.99
Steam Charts
WEBFISHING steam charts
630
10/11/2024
96
$4.99
Steam Charts
Lethal Company steam charts
6,077
10/23/2023
96
$9.99
Steam Charts
Bloons TD 6 steam charts
10,944
12/18/2018
96
$13.99
Steam Charts
Garry's Mod steam charts
30,925
11/29/2006
96
$9.99
Steam Charts
tModLoader steam charts
38,287
5/16/2020
96
Free
Steam Charts
Baldur's Gate 3 steam charts
103,144
8/3/2023
96
$59.99
Steam Charts
Split Fiction steam charts
16,426
3/6/2025
96
$49.99
Steam Charts
BattleBlock Theater® steam charts
311
5/15/2014
96
$4.49
Steam Charts
TCG Card Shop Simulator steam charts
2,251
9/15/2024
95
$12.99
Steam Charts
R.E.P.O. steam charts
107,021
2/26/2025
95
$9.99
Steam Charts
Just Shapes & Beats steam charts
282
5/31/2018
95
$19.99
Steam Charts
PowerWash Simulator steam charts
2,881
7/14/2022
95
$17.49
Steam Charts
Phasmophobia steam charts
12,721
9/18/2020
95
$19.99
Steam Charts
Goat Simulator 3 steam charts
435
2/15/2024
95
$29.99
Steam Charts
ATLYSS steam charts
154
11/22/2024
95
$9.99
Steam Charts
WolfQuest: Anniversary Edition steam charts
592
7/26/2019
95
$19.99
Steam Charts
Bopl Battle steam charts
438
11/16/2023
95
$9.99
Steam Charts
Wobbly Life steam charts
1,213
7/8/2020
95
$17.99
Steam Charts
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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, March 25). Steam Store. Steam Store.
  • Valve Corporation. (2025, March 25). Terraria on Steam. Steam Store.
  • Valve Corporation. (2025, May 8). Left 4 Dead 2 on Steam. Steam Store.
  • Valve Corporation. (2025, May 7). WEBFISHING on Steam. Steam Store.
  • Valve Corporation. (2025, May 10). Lethal Company on Steam. Steam Store.
  • Valve Corporation. (2025, May 9). Bloons TD 6 on Steam. Steam Store.
  • Valve Corporation. (2025, May 9). Garry's Mod on Steam. Steam Store.
  • Valve Corporation. (2025, May 1). tModLoader on Steam. Steam Store.
  • Valve Corporation. (2025, May 8). Baldur's Gate 3 on Steam. Steam Store.
  • Valve Corporation. (2025, May 9). Split Fiction on Steam. Steam Store.
  • Valve Corporation. (2025, May 8). BattleBlock Theater® on Steam. Steam Store.

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