There are no limits on how violent or creative you can be. Players often use the engine to create elaborate machines, intricate "pose" posters, or even full-length animations.
In its base "Sandbox" mode, players have the freedom to spawn non-player characters (NPCs), props, and ragdolls from various Source Engine games. ABOUT Garry’s Mod
GMod's longevity is largely due to its massive library of community-made addons. There are no limits on how violent or creative you can be