Current build version is: 8861

Last updated: June 25th, 2022

Hammer++ supports different branches of Source engine. You must click the correct one for the game you are mapping for, or Hammer++ will not start up. Installation instructions are found inside a README.txt file contained in the downloads.


To update Hammer++ if you had it already installed, download the new version, then simply drag and drop the files over your existing install. When you are asked to overwrite any files, click yes.

Video Tutorial

Game/Mod not listed?

You might still be able to use Hammer++ with it. If it's a multiplayer game or mod, use the Source SDK 2013 Multiplayer download. For singleplayer, try the Source SDK 2013 Singleplayer download.


Some Windows versions have an issue where the File Open dialog will freeze Hammer++. As a workaround, open hammerplusplus_settings.ini in Notepad and set FileDialogHack to false.

Unofficial games or mods tested

  • Garry's Mod: Community-made Tutorial.
  • Portal 2: Works under CSGO version. Must be installed onto CSGO and game configuration pointed to Portal 2 assets. Community-made Tutorial.
  • Left 4 Dead 2 : Half-works under CSGO version. Same method as Portal 2. Certain models will be shown as ERRORs.
  • Mapbase: Works using SDK 2013 Singleplayer version.
  • Momentum Mod: Likely to work using CSGO version.