DOOM can be played within Persona 5 Royal thanks to a mod available for the PC version of the excellent RPG from Atlus. However, it is the shareware edition of the shooter, which only grants access to the first campaign.
Considering that DOOM has been reproduced even with gut bacteria, literally, the mod in question was designed to fuel what has now become a meme, the «DOOM runs on…» that has been circulating for some years now.
In the case of Persona 5 Royal, the protagonist acquires a retro console and can use it to play some classics, and that’s where the modder stepped in to include the shareware edition of DOOM.
