Having recently downloaded a TADS interpreter for the first time, I decided to try out the most popular games. This was the highest on the list. In this game, you play as an amnesiac in a frozen underground base.
While this game had above-average plot, puzzles, and writing, it really shines in its pacing. From the very beginning, the game gave an impression of vast complexity (three bulkheads with three very different locks), but it always left you with a couple of new things to try. Every time, the couple of new things led to another part of the game, and so on. The game is, in fact, complex (look at the map!), but it's arranged so neatly that I never needed to use the map.
Very few games have the great feel that this gives you. I completed it in less than 2 hours.