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Garry's Mod (also known as GMod) is a sandbox physics game using the Source engine.

Garry's Mod (also known as GMod) is a sandbox physics game using the Source engine.

Garry's Mod is a standalone game but requires the Source SDK (and thus at least one game on Steam based on the Source engine, such as Half-Life 2, Counter-Strike: Source, Portal, or Team Fortress 2).

General Information