I’ve made it inside the House and am trying to build up a substantial enough map to discuss it in detail. In the meantime, I’ve run into a trick I’ve only seen a handful of times before (once in Philosopher’s Quest) where a puzzle intercepts nearly every possible input:
*e
There is a trap door on the floor, stuck open.
Written on it is ‘Only way out, Cantor’
You are in rows of wine racks that stretch out of sight in all directions.*d
This is the cheese room. The only opening is a trap door
above, too high to reach. The walls are made of cheese.
There is a ghost in the room.
Its nose is pink, I believe it has been drinking too much.*inventory
Although inebrious, the ghost blocks your attempt to inventory
*u
Although crapulous, the fiend hinders your attempt to u
*s
Although soused, the fiend stops your attempt to s
The only thing I’m able to do without getting stopped is >DROP items and to >QUIT the game.
>QUITting mentions it was more scared of me than I was of it, which I suppose is supposed to be a hint.
Renga in Blue 
The trick is at least as old as Colossal Cave.
I’ve run into a trick I’ve only seen a handful of times before (once in Philosopher’s Quest) where a puzzle intercepts nearly every possible input.
Don’t forget the Loud Room in Zork, in which almost all inputs are simply echoed back to you.
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