Bill Loguidice's 2004 entry for the The 1st Annual 1 to 2K Classic Text Adventure Competition, zipped, entitled The Traveler's Keeper. 
Bill: It's a .bas file, fully QBasic PC compatible (and likely compatible with other BASIC versions).  It was very challenging for obvious reasons (no entry over 2,816 bytes!), but lots of fun.  Programming is not a talent of mine - which is clear from the entry - but I had fun whipping up the story and trying to cram as many features as possible into such a tiny space (which required losing features, but I was still able to retain the important ones).  Anyway, it got a 9 out of 10 and was called "The best 2K competition game thus far!" and "Very sharp!".