I just noticed today, after that other blog post, that I completely skipped Level 16 it appears. I've read that this is a common glitch, and that the level is raced through at breakneck speed, leading to an extremely slow Level 20. I have no idea what the level stood for. Nevermind. Anyway, I now expect this next level will go very, very slowly...

Dr Brading.

P.S. I discovered Level 16 is called Magician Lord, a very nice name, but I am still happy to have moved past it.