Okay, this one's really old, but I really hope somebody recognizes it. I played this back in the early 90's on the Apple II at school. The game was about an old house, each room had a riddle to solve, and when you solved enough riddles, it let you go to the next floor. You start out in the basement, and the ending is in the attic, where you choose between 3 chests. One chest had diamonds or something, but I always chose the wrong one, sending me back to the basement.
It had a combination of color graphics and a simple text parser. The title was something like "Manor of Mystery" or "Riddle Castle", something like that. It definitely was not Mystery House, this was similar, but with color graphics and was a riddle-based treasure hunt, not a murder mystery.
Please help, I'm dying to relive the memories!