Garry's Mod, generally called GMOD, is a sandbox physics game that allows the player to manipulate objects and experiment with physics. Players can spawn a wide-array of props, and they can also spawn weapons, and NPC's, which depending on their alignment, attack the player. Garry's Mod requires at least 1 source game (CSS, Hl2, TF2, etc) to be able to play. The more source games, the more in-game content. However, more content can be downloaded from Steam-verified www.garrysmod.org. There not...