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Box art for Half-Life 2
MODMod · 2004 · Source

Half-Life 2

3 projects let you play Half-Life 2 together. Here's how they compare, and which one to start with.

A
Recommended

Synergy

Rated A (Complete), the highest of the 3 projects here. It has story co-op.

Website ↗

Every project, side by side

Recommended

Synergy

A
CompletePlay the story start to finish together, or a stable official co-op mode.
Stage
Playable
Co-op
91%
Synced
  • See each otherUnknown
  • StorySynced
  • EnemiesUnknown
  • WorldUnknown
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Dedicated server
Players
Not stated
Tested
Player reports
Features
Story co-opPlayer reports
Latest release
No release yet
Last activity
Unknown
GitHub stars
-
About this project

Free Steam mod for playing the HL2, Lost Coast and Episode campaigns (and other Source singleplayer mods) cooperatively. Steam shows 89 percent positive of 5,541 reviews. Player cap figures conflict across sources.

What you need

Your own copy of Half-Life 2.

Sources
Project page ↗Suggest a correction

Lambda Fortress

D
ExperimentalPrototype, research build, or abandoned before it got far.
Stage
In development
Co-op
15%
Synced
  • See each otherUnknown
  • StoryUnknown
  • EnemiesUnknown
  • WorldUnknown
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Not stated
Players
Not stated
Tested
Not checked
Features
-
Latest release
No release yet
Last activity
Unknown
GitHub stars
-
About this project

Lets TF2 mercenary classes play Half-Life 2 and other Source campaigns in co-op. Search results showed the Steam page as Coming soon, so release status is unverified.

What you need

Your own copy of Half-Life 2.

Sources
Project page ↗Suggest a correction

Obsidian Conflict

D
ExperimentalPrototype, research build, or abandoned before it got far.
Stage
Abandoned
Co-op
30%
Synced
  • See each otherUnknown
  • StoryUnknown
  • EnemiesUnknown
  • WorldUnknown
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Dedicated server
Players
Not stated
Tested
Not checked
Features
-
Latest release
No release yet
Last activity
Unknown
GitHub stars
-
About this project

Co-op mod with its own custom maps and lives system, also able to run HL2 content. An old Steam thread says it is no longer maintained and not guaranteed to work.

What you need

Your own copy of Half-Life 2.

Sources
Project page ↗Suggest a correction

Know another co-op mod for Half-Life 2? Submit it.