One of the biggest problems with modding Fallout is lack of proper mapper. Dimms Mapper is unfinished and lacks many necessary functions. I'll post my experiences with the official mapper. 1. I extracted Fallout .Dat files into Datax folder in Fallout2 folder. 2. I made following the modifications to Fallout2 mapper .cfg file: music_path1=C:\Fallout\data\sound\music\ critter_patches=C:\Fallout2\datax master_patches=C:\Fallout2\datax 3. The mapper worked but edited maps didn't work in Fallout. 4. I changed the 14h at offset 3 to 13h. It allowed me to run most of the maps that I edited in the official Fo2 mapper. 5. Some maps still didn't work. I recently discovered that it's caused by ladders. I suspect that if there was a possibility of somehow fixing the ladders after editing, it would be possible to edit every Fallout1 map with Fallout2 mappers. I don't know much about the file structure of Fallout maps and how ladders work so I'm stuck. Any ideas?