You Find Yourself in a Room.

You Find Yourself in a Room explores the concept of text adventure as a mode of abuse. The parser is sinister and overtly hateful. It tells you that it doesn't always understand you because it "likes making you guess." It places you in testing rooms and then mocks you for having trouble, in a way that's vaguely reminiscent of Portal's GLaDOS. The puzzles themselves start very simple and grow progressively more laborious, though they mostly stick to very standard tropes of escape-the-room games, with a lot of hunting for keys or codes.

This may not sound like an especially enjoyable concept, but it does actually work pretty well, for a couple of reasons. First, the scope of action is so tightly confined that it's impossible to get distracted by red herrings. Second, there's no time-wasting. The parser's jeering provides some hints and guidance, and also makes your fumbling part of the story. I at least found that I always figured out how to move on to the next room just before losing faith in the game's fairness.

It's short (I think it took me all of five minutes), and I'm not sure I would call it either fun or deep, but it does an excellent job of what it sets out to do.