ZDoom

I recently made a custom map, added custom pictures for the title and logo and a custom song I composed and recorded myself.

This song (mp3) is in a separate WAD and I would love to know how to merge both WADs into a single file. Currently I have to select both WADs and drag them to the GZdoom executable, which is not much of a problem but having a single file would make it more comfy.

I tried putting them both into a zip file, but it would load the original Doom 2 instead of my mod. Also tried changing the extension to pk3 and nothing changed.

HELP D:

Just putting both wads into a zip/pk3 sometimes works but is very much not recommended. You can use zip/pk3 files for GZDoom specifically, if you follow the instructions on the [wiki]Using_ZIPs_as_WAD_replacement[/wiki] page. Or you can use regular wad files if your project is designed for non-gzdoom compatibility.

Either way, you will probably want to use a lump editor to extract and compile the contents of your wads. SLADE is one such editor, meaning it can manage the contents of .wad files. You can simply open both files and copy the stuff you want from one into the other.

Note that .wad files are dependent on lump ordering and require the use of "markers" to separate different kinds of data. See the Namespaces article on the zdoom wiki, and wad article on Doomwiki for more details on how wad files are organized.