| A text adventure game by Jacob Weinstein. The plot of the game is that a certain Ivy League campus has been invaded by some strange military force, and you're supposed to liberate it. Interesting puzzles and clever design. The game is implemented with TADS.
When I was visiting Princeton while on tour with a choir, a friend of mine was amazing the rest of us by identifying the buildings and giving bits of their history a few minutes before the tour guide said them. After we pressed him for over an hour to reveal his sources (he'd never been to the East Coast in his life, let alone the university), he finally explained that he'd been playing this game. I guess that's a compliment to the author for writing the game true to the geography. | 
