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Amnesia: The Dark Descent / 2010

Amnesia: The Dark Descent Co-op.

Two players, two lanterns and one campaign. Shared objects, monsters and the ability to revive your teammate.

Screenshot of Amnesia: The Dark Descent

A familiar story. Now together.

Co-op built on the open-source Amnesia game and HPL2 engine. Doors, objects and physics are synchronised; the host runs the monsters, which can pursue either player. A downed teammate can be revived. Continue together loads the host’s world save while keeping each player’s own inventory. The author describes two-player campaign play over direct IP; most testing used two game instances on one PC.

BUILT WITH CLAUDE

What the author says

The author lists Claude in Co-Authored-By trailers on co-op commits, including 65ef7ab for continuing a game together. The original game and HPL2 code belong to Frictional Games.

Evidence in the repository Documentation checked: 21 Oct 2026. We have not tested this mod in-game.
ClaudeTwo-player campaignDirect IPRevive

GETTING READY TO PLAY

How to get started

  1. Each player needs their own Steam or GOG copy of Amnesia: The Dark Descent and matching mod versions: v0.1.0.
  2. Open the author’s repository, then Releases → v0.1.0. The recommended Windows package is amnesia-coop-0.1.0-windows.zip, with Steam lobbies. The Source code archives are for building from source.
  3. Extract the package into the game folder beside Amnesia.exe without replacing original game files. Install the VC++ 2015–2022 x86 runtime if needed. Launch Amnesia_coop.exe → Co-op.
  4. For Steam lobbies, both players start Steam, then use Host for friends / Invite friend. The required steam_api.dll is included in the recommended Windows package; the mod uses test AppID 480.
  5. amnesia-coop-0.1.0-nosteam-windows.zip supports direct IP only: Host by IP / Join by IP, UDP 27960 or a shared VPN network. The host then chooses Start game / Continue together. Follow the author’s README for the experimental Linux/macOS packages.

Read the latest README in the author’s GitHub repository before installing.

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