Garry's Mod (aka "Gmod" for short) is a first-person shooter video game made by Facepunch Studios. The game is particularly meant for modding, as you can add maps or weapons to your game anytime from the Steam workshop. Garry's Mod has been a huge success from over the years.

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Gameplays Mod are very common on many YouTube channels, especially Markiplier, who plays it with Jacksepticeye a lot, such as Gmod Murderer or Sandbox funny moments.