Games entirely self contained indoors in the villains lair

No retreating to the neighboring town for supplies, no dicking around in the Gold Saucer area (unless settlements were dug inside somehow).

Inner courtyards and the like is fine though.

Witchaven.

Maniac Mansion is like this.

Good choice and have a more accurately arranged map good sir.

In a similar vein there's Hugo.

Haunting Ground, if the mansion's surroundings count. You're still very much trapped.

Aren't all Devil May Cry with Dante like that?
Except for the first stage in DMC3, I'm pretty sure they take place in one.. place. I know 1 is set in a castle and 3 is set in a tower.

Resident Evil 1?
Portal games, I guess.
Super House of Dead Ninjas.
System shock games?
I haven't finished all of these and I'm way too tired to look it up.

Clocktower for the SNES i suppose

Mario 64, technically

...

Well at least if it actually counts as a game