The Gostak

The goal of this game is straightforward; as the gostak, you distim the doshes. Alas, the lutt to the doshery is crenned with glauds! But surely a snave gostak such as yourself can discren them.

And, I note, the entire game is like this, including very and deeply extensive meta information. At no point is the central linguistic conceit dropped. I'm a sucker for this, and indeed this is one of my favorite games as a result, but more importantly, the game is approachable in a way that most IF with a metatextual conceit is not. That said, some basic familiarity with the standard Inform library will greatly enhance one's experience with the game, as many (to me) critical clues for solving the game's language came from default responses.