The main menu is the menu shown when you start Garry's Mod. It contains ten options to choose from, each with a specific purpose. The background consists of a slide show of various images created using Garry's Mod.
Opens a map list to start a single player or local multiplayer game. By switching the gamemode with the Game Mode Selector, you can start the game in different gamemodes.
Opens the Garry's Mod Server Browser.
Opens the Demos menu, which lets you see all of your saved demos, as well as demos uploaded to steam.
Opens the Saves menu, which lets you see all of your saved saves, as well as saves uploaded to steam.
Opens the Options menu.
Closes Garry's Mod.
Opens a list that shows all steam games that are compatible with Garry's Mod, and shows if they are installed, disabled (unmounted), or enabled(mounted).
Red cross means you do not own that game, folder with a small minus sign means the game is not installed.
Opens a menu containing flags from different countries representing languages. Clicking on a flag changes the current language.
Switches the current gamemode. The default gamemode is Sandbox. On installation, the only other gamemode available is Trouble In Terrorist Town. More gamemodes can be added through the use of the addons menu.