Haha yeah T is scary. I saw the Nethack screenshot above. You all get it.
Dwarf Fortress I need to give another shot. Kinda feels like the Sims to me in that you can direct things but also just watch it all go downhill. I have played the adventure mode a bit but it seems more to explore the civilization you watched get destroyed.
These games are made this century (they just look old) and they have a odnd spirit the just hits me, most are free and open source, the code for some is pretty advanced with how they randomize and simulate generated material.
Give any of those mentioned above a shot and let me know what you think. Make sure to download the tile or tileset versions. Makes it easier to learn IMO.
Those above are mostly free and on Linux, Mac and PC.
Dungeon Crawl Stone Soup (The best traditional Fantasy DnD dungeon delve on a computer game RL)
Caves of Qud (GAMMA WORLD the rl w/ overworld - Reminds me of ASE but on the computer ... new megadungeon patch!)
Cataclysm: Dark Days Ahead (The best non fantasy if survival is your jam, Zombies but you can replace them with wolves or dinosaurs easy -w/overworld and very freeform -likely the most complex one here)
Brouge (Very friendly if you have not played one before)
DoomRL (Simple and quick, Run and Gun, reminds me of Diablo if it stayed turn based in development)
Ancient Domains of Mystery (w/ overworld)
Tales of Maj'Eyal (Current version of the LoTR RL JRR fam made them change the name w/ overworld)
For phone, Pathos Nethack and Pixel Dungeon are free and good
Many of the above have overworlds if you like Ultima. Let me know what you all think!