Special relevance to Lisp: this game involves procedurally-generated puzzles so that you never play the same level twice. I doubt I would have been able to pull

Special relevance to Lisp: this game involves procedurally-generated puzzles so that you never play the same level twice. I doubt I would have been able to pull this off the way I did, without a dialect of Lisp to use in generating non-trivial (yet always-solvable) puzzles for the player.