Porting Doom 3 requires adding a few files in order to play it.
The status of a demo version is unknown.
Here is the list of files to add in order to play the full version:
┣ 📁 recalbox
┃ ┣ 📁 share
┃ ┃ ┣ 📁 roms
┃ ┃ ┃ ┣ 📁 ports
┃ ┃ ┃ ┃ ┣ 📁 Doom 3
┃ ┃ ┃ ┃ ┃ ┣ 📁 base
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 config.spec
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 default.cfg
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 doomkey
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 libretro.cfg
┃ ┃ ┃ ┃ ┃ ┃ ┣ 📁 maps
┃ ┃ ┃ ┃ ┃ ┃ ┃ ┣ 📁 game
┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┣ 📁 mars_city1
┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┣ 📁 textures
┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 objective1.tga
┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 objective2.tga
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 pak000.pk4
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 pak001.pk4
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 pak002.pk4
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 pak003.pk4
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 pak004.pk4
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 pak005.pk4
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 pak006.pk4
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 pak007.pk4
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 pak008.pk4
┃ ┃ ┃ ┃ ┃ ┃ ┣ 📁 savegames
┃ ┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 AutoSave__Mars_City.save
┃ ┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 AutoSave__Mars_City.txt
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 xpkey
┃ ┃ ┃ ┃ ┃ ┣ 📁 d3xp
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 pak000.pk4
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🗒 pak001.pk4