Hey @LabNewt. Thanks for the question about other levels. Thought I'd answer you here so that everyone can appreciate the knowledge. You can find other special levels in the Notable Levels subforum using the prefix "Special." ;)
There are two benefits to this as well though: 1. the rare funny / unique / artistic / demo / mechanism / cut-away or otherwise special cards are much easier to find now in the forums vice the huge - mostly chronological - collection of levels, and 2. People who go to the Levels section should now only see primarily what they are looking for: levels to play.
And the average quality of uploaded levels is also hopefully raised as there is less clutter now from non-fully-polished levels in the Levels section.
Thanks for elaborating @nGord. This and my recent studies of the rather polished levels by more skilled members will make me delete my crude ones. Perchance find me at Special shortly ;)