Garry’s Mod (commonly abbreviated as gmod), is a sandbox physics game created by Garry Newman. It was originally a mod for Valve’s Half-Life 2, but was later made into a standalone release in 2006. Currently it’s a fun game to play with friends :)
🛑⚠️ EDIT: This guide was written in 2015 and is mostly outdated now ⚠️🛑