Thief 3’s Cradle level was formative in the way that I have never ever seen a better horror game. Overall I didn’t like the game as much as the previous two. But the Cradle is unsurpassed.
The demo for Alone in the Dark 1 also lives rent free in my head because it was one of the few games we had back then. Plus the graphics were absolutely astonishing. But I never knew how to finish it. I always died pretty quickly to some dog monster. I never played the full game.