Steam

I only had the first one. I found it at a yard sale, and luckily they also had the instruction manual and hint book. The game had a check where when you tried to go to the second floor, it would ask you like "what is the third word on the page with a picture of an axe in the corner in the instruction manual?". Early DRM. If you got it wrong, I'm pretty sure you couldn't proceed.

The hint book was also written in character from the point of view of someone who had gone before you. It was like an idiot noble and his long suffering servant. Great way of doing it.