Thx, did that. I tried adding resources from megagame.wad, but apparently ther is only one texture in it?
Then added MM8BDM-SGC.pk3 and found more textures.
Trying to add skulltag.pk3 and skulltag_data.pk3 crashed the editor
So I built a simple room using textures from MM8BDM-SGC.pk3 and set a player start.
But I how do I test the map?
How can I edit the existing deathmaptch maps (Editor couldn't find maps in megagame.wad)?