The id Tech 4 engine follows a strict "Last-In, First-Out" logic for these files, which is a cornerstone for modding without breaking the original game:
If you create a folder in base/ called maps , and inside it place game/mars_city1.map , the game will load your version instead of the one inside pak000.pk4 . This means you never need to modify the original PK4 files. This is a safe, reversible way to mod. doom 3 pk4 files
: Scientist Dr. Malcolm Betruger has been conducting secret teleportation experiments that accidentally open a gateway to Hell. The id Tech 4 engine follows a strict