Lists and Lists

From time to time, Andrew Plotkin has written works that are more about demonstrating what is possible from a technology standpoint than they are about delivering great stories. Lists and Lists is one of this type, and it certainly makes a deep impression when one finds oneself interacting with a Scheme interpreter instead of a normal command prompt.

The provided plot is the flimsiest excuse for presenting a test of programming skill in a language that few people are likely to be familiar with. The difficulty curve of the challenges is not linear, and it increases sharply toward the end of the series.

I don't normally recommend IF that is purely about the logic puzzles, but this piece is such a unique achievement that I think it's a must-see for anyone interested in IF as a whole. Arguably, at its core it is not so much IF as it is INF (Interactive Non-Fiction). Equally arguably, it is a stand-out example of puzzle design featuring a consistent, discoverable logical framework with very fair hinting and considerable challenge -- though I think any such argument would be disingenuous because none of Plotkin's genuine games are so derivative of the work of others. In any case, it is worth reviewing as a notable experiment, and as a bonus you'll learn something about an historically-significant programming language!

(Note: My scoring rubric implies that this work should earn a five-star score on the basis of its introduction an entirely new technique. However, although it was enjoyable and remarkable, I can't honestly say that it feels like a proper game to me, nor do I think it was truly intended to be thought of as one.)