The non-Steam version of "Garry's Mod" is a standalone sandbox physics game that uses the "Half-Life 2" Source engine and allows players to manipulate characters, objects and physics within the "Half-Life 2" universe. "Garry's Mod" started as a "Half-Life 2" modification but developed into a full game in 2006.
"Garry's Mod" has no goals and allows players the ability to manipulate items however they wish without any restrictions. Players insert characters, weapons, furniture and enemies from "Half Life 2." The Physics Gun allows players to pick up and position objects to create scenes and experiments. "Garry's Mod" also allows players to initiate ragdoll mode to move characters and pose them in a variety of ways.