Garry's Mod Hits 1,000,000 Sold - Game Informer

Garry’s Mod, essentially a big sand box which allows players to experiment with Valve’s physics engine, has hit big milestone today with over 1,000,000 served.

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Garry's Mod has sold over 3.5M copies since release – Destructoid

Garry's Mod has sold over 3.5 million copies since its release

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Garry's Mod moves over 1 million lifetime

So close to 10,000 hours, after about 8 years of playing this game, so many memories of friends and fighting source engine crashing a lot, good times : r/gmod

Concurrent Steam Users Top 8.46 Million In Early Hours Of 2015 - Game Informer