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So why not? The technical challenges are immense. GMod is built on Valve's aging but deeply complex Source engine, originally designed for Windows PCs. Porting an entire physics engine, scripting system, and modding framework to mobile devices would be a monumental undertaking—one that likely isn't economically justifiable for a $10 game in 2024/25.
If you are searching for a genuine, playable Android port of Garry's Mod (Gmod), gmod android port download link