Garry's Mod uses subscribed Workshop addons and custom game modes. Some content requires mounted games or other addons; the Workshop page's dependencies explain missing models and textures.

Read the selected package’s required game version and dependencies.
Let the game or platform manage the supported installation route.
Enable the intended content using the game’s own selection or mod menu, then test it before loading an important save.

Steam Workshop ↗

Heimdall uses the route defined for this edition. A catalog listing does not verify an individual package’s compatibility.

Know your edition

Game details

Where to play

Windows · macOS · Linux

Platforms shown are for this Steam edition. Features and available content can differ on other stores and consoles.

Official game information ↗

Steam features

Single-player · Multi-player · PvP · Online PvP · Co-op · Online Co-op · Cross-Platform Multiplayer

Release listed on Steam: 29 Nov, 2006

Before you play

Check the store’s current system requirements and available languages for your device.

System requirements ↗

Sources & review

Reviewed October 13, 2026. This page covers Steam app 4000. The game’s presence in the most-played snapshot is not a mod compatibility rating.

View game definition ↗