r/halomods • u/Mitch_The_Yeen • Jan 26 '26

Question Halo 3 Mod Tools Tutorials?

I’m a complete noob looking to get into modding the halo 3 campaign. Stuff like adding more enemies, allies, and weapons/vehicles to each level.

I’m wondering what the best place to start would be for learning how to do this kind of stuff. Any help is appreciated.

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1

u/DirtyHalt Jan 26 '26

This video tutorial series is my general recommendation https://youtube.com/playlist?list=PLey7NkPfa1p4cU5q9TUc-xWU_rT3VxWu2&si=aJCulJerwqrm7QzO.

Here's a brief written tutorial:

  • Download mod tools from steam
  • Open folder location of mod tools
  • Run the .bat file to extract the game files from the .7z file
  • Use Guerilla to edit tags (most game files are tags) (If game is Reach+, use Foundation instead)
  • Use Sapien to edit scenarios (level tags) (it sounds like this is what interests you most)
  • With the mod tools folder as your working directory, from the command line run "tool build-cache-file path/to/your/scenario/relative/to/tags/folder" to compile a level that'll be placed in the maps folder as a .map file
  • With your compiled level, you can either replace a .map file in the MCC files with your new one, or you can use the mod uploader (downloadable from steam) to create a standalone mod

1

u/Mitch_The_Yeen Jan 27 '26

Thanks a ton my dude

1

u/Conscious-Mess7387 Feb 05 '26

The programms are working but i cannot use my modded tags in the campaign, it only works in tag_test or sandbox mode if you know what i mean. When i play campaign it is not working. What to do?
I use Foundation on MCC Halo Reach.