@scavy Thanks for all the explanation! I will do that. Unfortunately, both my roms and the system are record in the same SD card (´;︵;`)

Hello @boblablah you need to add roms (*wad) in doom folder /recalbox/share/roms/prboom Check readme.txt Just copy the files in the corresponding folder. You can use either .zip files or uncompressed roms. To refresh the game library, go to the Menu, then Games Settings then Update Games Lists source : Manual wiki