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Garry's Mod is a physics sandbox. There aren't any predefined aims or goals. We give you the tools and leave you to play.

You spawn objects and weld them together to create your own contraptions - whether that's a car, a rocket, a catapult or something that doesn't have a name yet - that's up to you. You can do it offline, or join the thousands of players who play online each day.

If you're not too great at construction - don't worry! You can place a variety of characters in silly positions. But if you want to do more, we have the means.

Beyond the Sandbox

The Garry's Mod community is a tremendous source of content and has added hundreds of unique modes to the game. In Trouble In Terrorist Town, you can be a detective solving an online murder as criminals attempt to cover up their homicides. Be a ball, a plant, a chair, or anything else in Prop Hunt's elaborate, shape-shifting game of Hide & Seek. Elevator: Source is gaming's first elevator thrill ride, delivering players to airlocks and kitten dance parties.

We have one of the most vibrant Steam Community Workshops, with over 300'000 models, maps, and contraptions to download. It has everything from new tools to improve your builds, to guns that fire rainbow-tinged nuclear blasts from space. Take as much or as little as you need: it’s all free.

Please note: Some multiplayer servers and game-modes might require you to own other games - such as Counter-Strike: Source and Team Fortress 2.

The July 2017 Update Will Be Released Next Week

Hey, we're planning to push the next Garry's Mod update next week on 2017-07-10. There's quite a lot of changes, so if you're running a server you'll probably want to at least try it out.

The update may not look like much, but I'm hoping that these internal changes are going to help us bring some more interesting updates in the future.

Pre-release Steam Branch

The Pre-Release Steam branch for Garry's Mod has been updated and contains all the changes that will be included in the next update. It is backwards compatible with the current version of the game, so if you are using it you'll still be able to connect to servers that haven't updated.

There will be instructions at the bottom of this post on how to join the Pre-Release branch.

Changelog

Windows builds of the game now use the Visual Studio 2017 C++ Runtime. This should hopefully not affect anybody, but could perhaps break some third-party binary modules.

Linux builds of the game now depend on GLIBCXX 3.4.19. You may run in to some issues if your server's C++ runtime is a decade out of date. Steam should handle this for you if you're just playing the game.

Game Changes
NEW - Preset support for Utilities menus
NEW - 'Quick Preset' button - allows for easier access to the preset system
UPDATED - Weapons no longer turn upside-down when zooming in too far
UPDATED - Improved support for CS:GO/Portal 2/TF2 maps
UPDATED - Game returns to DirectX 9 mode if '-dxlevel' is not specified in the command-line
UPDATED - Improved relationships between Half-Life and Half-Life 2 NPCs
UPDATED - Demos, saves, and duplications menus can now list items that the user is subscribed to
UPDATED - Addons menu can now manage multiple addons at once (e.g. bulk unsubscribing)
UPDATED - Improved behaviour of collisions between players and 'no collided' entities created by tools
FIXED - Odessa no longer has female voices
FIXED - Fixed errors caused by the spawn menu's search feature not having access to certain directories
FIXED - Fixed many crashes related to NPCs trying to use non-existent entities
FIXED - Checkboxes and ratio buttons in HTML panels are now displayed properly on Linux/macOS
FIXED - Half-Life Icthyosaur can now cause damage
FIXED - Half-Life Tentacle NPC no longer continues playing sounds after being removed

Lua API Changes
NEW - Entity:PhysicsInitStatic( ... )
NEW - Entity:RemoveCallback( ... )
NEW - Entity:GetCallbacks( ... )
NEW - CLuaEmitter::IsValid( ... )
UPDATED - Entity:PhysicsInit* methods now return either true or false based on success
UPDATED - Entity:Remove() can no longer remove the world
UPDATED - Weapon:IsScripted() will now return false instead of no value when ran on non-scripted weapons
UPDATED - Player:Give( ... ) no longer fills a player's gun with ammo when asked to not give ammo to players
UPDATED - Entity:GetBoneCount() and Entity:GetBoneParent( ... ) will now return -1 on failure
UPDATED - Entity:TranslateBoneToPhysBone( ... ) will now return -1 on failure
UPDATED - Entity:SetSaveValue( ... ) now returns false on failure
UPDATED - Entity:DispatchTraceAttack( ... ) will now trigger an error when passed invalid parameters
UPDATED - Entity:HasBoneManipulations() and Entity:HasFlexManipulatior() return false on failure
UPDATED - Entity:GetBrushPlaneCount() will now return false on failure
UPDATED - Entity:GetFlexScale( ... ) now always returns 1 on failure, rather than just sometimes
FIXED - Entity:GetBrushPlaneCount() and Entity:GetBrushPlane( ... ) now work on brush entities
FIXED - PathFollower:Compute() no longer leaks Lua references

Hammer Changes
UPDATED - Improved performance of 2D/3D views
UPDATED - 2D views are now rendered during scroll operations, rather than after
UPDATED - Increased max render distance from 10,000 to 32,000
UPDATED - Vertices no longer need to be in the exact same location to be merged
FIXED - Blended textures are now rendered correctly - it should be identical to in-game
FIXED - Model browser no longer freezes after being opened multiple times
FIXED - Overlays no longer flicker when rendered in 3D shaded mode
FIXED - Scrollbars on 2D views are now correctly sized when zoomed in

Other Stuff
NEW - The '-notty' startup parameter on Linux servers will send console output directly to stdout
UPDATED - Added more information to crash dumps (.mdmp files)
UPDATED - r_eyes_* console variables are no longer saved
UPDATED - Explosion effect no longer creates sounds - this doesn't mean that explosions are silent
UPDATED - Bots can no longer be created before the InitPostEntity hook has ran
UPDATED - Improved how serverside ragdolls are handled on the client - hull traces can hit them now
FIXED - Fixed crash that occurs when console variables created by Lua are removed too early on level change
FIXED - Fixed late loading of memory allocator on Linux causing the game to crash for some people
FIXED - Impulse 200 command no longer crashes when the player has no active weapon
FIXED - Fixed prediction errors when firing weapon_357
FIXED - weapon_357 now has the 'revolver' holdtype

How to Switch Between Branches

[olist]
Exit the game
Right click on Garry's Mod in Steam and select Properties
Go to the Betas tab and select your desired branch
[/olist]
None - This is the normal version of the game
Pre-Release - This is the next update
Dev - This is a bleeding edge version of the game, expect it to contain more bugs than usual