Doom II RPG is what it says on the label, and it’s ready for PC 13 years later
Enlarge / Doom II RPG isn't exactly like Doom, but you can't accuse it of lacking chainsaws. (credit: id Software)
"Mobile games" were something else entirely in 2005, a time in which Windows Mobile was a viable platform, the only Apple phone was a Motorola ROKR, and none of them had a shot at running Doom, let alone its sequel. That's why id Software made Doom RPG, the weirdest official Doom game that is also still a bit fun. A group of fans known as GEC.Inc ported that game to modern PCs, and they've finally gotten around to its sequel.
Doom II RPG, the iOS version from 2009, is playable the same way Doom RPG was: with an understanding that you, a person in 2023, will somehow have access to the original, potentially still copyrighted assets of the game. The instructions lead you through setting up OpenAL, then loading in an .ipa iOS file (the Internet Archive has a copy). You can use a touchscreen, most modern game controllers, or just your keyboard and mouse. You'll then get to play a Doom II that's not quite like what you're thinking of when you think of Doom II.
Playing Doom without the Doom Guy? The 2000s were a wild time.
How does it play? A bit awkwardly, unless you're used to the turn-based, grid-moving, RNG-dominated RPGs of earlier eras. With each turn, you can move in one of four directions, attack with a weapon, or perform some other action, like ripping a toilet fixture off the wall for later throwing (if you're strong enough). If you end up face to face with an imp, there's not much else to do except trade blows, hoping the random hit/miss mechanics are in your favor or that you have enough health packs or snacks to hold out.