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Garry’s Mod Map Compatibility: Check Files and Dependencies

A map revision or BSP version cannot certify GMod compatibility. Verify the exact map, branch, dependencies, current Workshop copy, and behavior in the target build.
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There is no single “map version” number that proves a Garry’s Mod map works with a particular game build. Check the exact map file, the game branch, its content dependencies, and whether the server and client have the same current map. Then load it in the build you plan to use and test the features that matter.

What the map version number tells you

Garry’s Mod’s game.GetMapVersion() returns a map revision and a BSP version. The revision is not the VBSP version: it counts how many times the map was saved in Hammer before compilation. That can help identify whether a map file changed, but it does not certify compatibility with a particular Garry’s Mod build. Facepunch’s game.GetMapVersion documentation explains the distinction.

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The official sources do not provide a complete table mapping every BSP or VBSP version to every Garry’s Mod branch or build. Do not infer universal compatibility from a BSP version alone.

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Check the map and target build

  1. Identify the exact map. For a dedicated server, the map is selected by its file name without the .bsp extension. The Workshop page description is a documented place to find that file name. Facepunch’s dedicated server guide covers server map configuration.
  2. Record the game branch and build you intend to use. Note whether you are checking the normal branch or a beta branch, and ensure the client and server are on the intended branch.
  3. Confirm which copy of the map is installed. If the map comes from Workshop, verify the current map content on both client and server. Facepunch warns that disabling Workshop auto-updates can leave a server with an older map, which may stop players joining after an update. A server collection can mark its map for client download. See Workshop for Dedicated Servers.

Check required content and mounted games

A map may use assets included with the map, supplied by Workshop addons, or available through mounted games. The path command lists active search paths; Facepunch’s examples include mounted cstrike, hl2, and tf folders. Compare the map’s Workshop description and requirements with the active paths when textures, models, or other assets are missing. Facepunch’s Getting Started with Garry’s Mod guide documents search paths and mounted content.

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Having some content from a game does not necessarily mean its maps are installed. Facepunch’s July 2025 announcement said much Counter-Strike: Source and Half-Life 2 Episodic content became available by default, but the games’ maps were not included and still required installing those games. The change reduced some missing-content cases; it did not remove every dependency. Read the July 2025 update notice.

Test it in the build you will actually use

After checking the file, branch, and dependencies, load the exact map in the target build. A successful load is only part of the check: inspect whether required assets appear and exercise the rendering or gameplay features relevant to your use. This is practical verification, not a formal guarantee supplied by a version number.

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Keep load failures, missing assets, and changed appearance distinct when comparing two copies of a map. Record the exact map file name, Workshop or addon version, target branch/build, relevant mounted content, and what you observed. Those details help identify whether the problem is an outdated copy, a missing dependency, or a change in how the game renders the map.

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Why a map can look different after an update

Compatibility is not always simply “loads” or “does not load.” In November 2025, Garry’s Mod added water-rendering features, and Facepunch noted that a small number of existing maps might display water unexpectedly because modified materials began using parameters that had not worked before. The notice said map makers would need to edit those materials; recompiling the maps was not required. Read the November 2025 update notice.

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That example shows why a map can load while a specific visual feature changes after an update. For rendering issues, check the map’s materials and update notes rather than assuming the BSP version alone explains the difference.

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