There's an aspect of old-school D&D where it's less what we think of as an RPG today as more like a human-moderated tabletop roguelike video game, and from the @SystemMastery review, apparently Tunnels & Trolls is actually *even more* like that than D&D.

T&T is that much more a game that's meant to be played by what by today's standards would be an absurdly large play group, and even more focused on doing stuff in dungeons. Which isn't a bad thing, but like a lot of D&D stuff, it's an extremely _specific_ thing.