As of 2015, the only legal way to play "Garry's Mod" is to use the Steam platform. Facepunch Studios LTD released the last free, non-Steam version of "Garry's Mod" on November 27, 2005. The company moved "Garry's Mod" to Steam on November 29, 2006.
Some tips for playing "Garry's Mod" include using the Physics Gun to pick up and adjust objects and using ragdoll posing mode to move ragdolls and freeze them into positions or scenes. Another tip for playing "Garry's Mod" is to use face posing to manipulate the faces of NPC characters.
Use "Garry's Mod" to run experiments that test the physics capabilities of the "Half-Life 2" engine utilized by "Garry's Mod," such as building a rocket and flying it to the moon or constructing a car. Use props from any game that runs on the "Half-Life 2" Source engine. Select props and objects using the Physics Gun and rotate them. The Physics Gun allows players to freeze objects in place even while in midair.
"Garry's Mod" has a variety of game modes, which allow the player to set up a goal or plot. These include playing football, running a jail or fighting a certain boss. Use the Tool Gun to hold objects together and create interactive buttons and switches. The Tool Gun also creates controllable wheels and boats and controls player add-ons or modifications to "Garry's Mod."