I constructed four classic puzzles for the test, and MellowMelon had constructed five; when choosing which four to actually use on the test, we decided that we'd covered enough of a range of difficulty levels that it came down to which ones were the most artistic. My puzzle themed around the mathematical constant e (by the way, kudos if you saw this theme before I mentioned it on my blog just now!) was thus deemed more suited for the test than the puzzle I used as a preview and the puzzle below.
