A few weeks ago, when I heard about the shiny new aperiodic monotile that had been discovered, I immediately had to add it to the collection of grids that you can play Loopy on, in my puzzle collection.

This went fine, except for the fact that I got most of the way through implementing one algorithm for generating pieces of the tiling, and then threw it away and started again because I'd had a much better idea.

In fact, there are so many things I like about the algorithm I ended up with that I've decided it deserves a proper public writeup. So I've spent the Easter weekend hard at work on producing one. I present: https://www.chiark.greenend.org.uk/~sgtatham/quasiblog/aperiodic-tilings/