The Tiniest Room

Twiny Jam is a competition requiring entries to have 300 words or less in the code. Many of these games are pretty spare. This game is one of the richest and complex I've seen within this word limit. It is a one-room escape game with numerous puzzles.

As a non-Twiny Jam game, it is only a short bit of fun. But as an example of what you can do in a constrained format, it is excellent.