Text adventures seem suitable for this sort of thing, and are relatively easy to write. They’re probably not as good for mass appeal, but might be OK for mass nerd appeal. For these purposes, though, I’m worried that rationality may be too much of a suitcase term, consisting of very different groups of subskills that go well with very different kinds of game.
Another thing that’s relatively easy to create is a Neverwinter Nights module, but you’re pretty much stuck with the D&D mechanics if you go that route.
Text adventures seem suitable for this sort of thing, and are relatively easy to write. They’re probably not as good for mass appeal, but might be OK for mass nerd appeal. For these purposes, though, I’m worried that rationality may be too much of a suitcase term, consisting of very different groups of subskills that go well with very different kinds of game.
Another thing that’s relatively easy to create is a Neverwinter Nights module, but you’re pretty much stuck with the D&D mechanics if you go that route.