Best Online Co-Op Games on Steam

Unlike generic lists, our strategy game recommendations use a rigorous analysis of Steam user reviews to identify and feature only the best, community-validated online co-op games. For those who prefer not to search, check out lists of the most played, top deals and best free to play Online Co-Op games on Steam.

Filters & Lists
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.

Price 9.99€
Rating 9.6
Release 29 Nov 2006
Call of Duty® 2 Call of Duty® 2 redefines the cinematic intensity and chaos of battle as seen through the eyes of ordinary soldiers fighting together in epic WWII conflicts. The sequel to 2003's Call of Duty, winner of over 80 Game of the Year awards, Call of Duty 2 offers more immense, more intense, more realistic battles than ever before, thanks to...

Price 19.99€
Rating 9.1
Release 13 Oct 2006
DEFCON Inspired by the 1983 cult classic film, Wargames, DEFCON superbly evokes the tension, paranoia and suspicion of the Cold War era, playing on the fascinating aspects of psychological gameplay that occur during strategic nuclear warfare.

Price -91% 1.16€
Rating 8.4
Release 29 Sep 2006
Counter-Strike: Condition Zero With its extensive Tour of Duty campaign, a near-limitless number of skirmish modes, updates and new content for Counter-Strike's award-winning multiplayer game play, plus over 12 bonus single player missions, Counter-Strike: Condition Zero is a tremendous offering of single and multiplayer content.

Price 8.19€
Rating 9.0
Release 01 Mar 2004
Team Fortress Classic One of the most popular online action games of all time, Team Fortress Classic features over nine character classes -- from Medic to Spy to Demolition Man -- enlisted in a unique style of online team warfare. Each character class possesses unique weapons, items, and abilities, as teams compete online in a variety of game play modes.

Price 4.99€
Rating 8.5
Release 01 Apr 1999
GRID 2 Be fast, be first and be famous as the race returns in GRID 2, the sequel to the BAFTA-award winning, multi-million selling Race Driver: GRID.

Price 6.37€
Rating 8.2
Release -
Warhammer 40,000: Dawn of War II: Retribution Command any of the six unique factions in the next standalone expansion of the critically acclaimed Dawn of War real-time strategy franchise. Choose to build a massive army or lead a small squad of elite heroes into battle and experience a single player campaign customized to your favorite race.

Price -73% 7.87€
Rating 8.8
Release -
Sniper Elite V2 In the dark days of the end of World War Two amidst the ruins of Berlin, one bullet can change history…

Price -88% 2.99€
Rating 8.7
Release -
Resident Evil 6 Benchmark Tool Download the official Resident Evil 6 PC Benchmark and see if your system is ready for Capcom's latest installment of the Resident Evil franchise!

Price Free to play
Rating 8.0
Release -
Serious Sam Fusion 2017 (beta) Serious Sam Fusion is a central hub for several existing Serious Sam games developed by Croteam. Cool new features, engine upgrades, patches and updates will be released to existing owners for FREE!

Price 14.99€
Rating 9.0
Release -