Mystery heatmaps.
Each one shades every Guardle gallery by some quantity: what a guard there would see, how far it is from things,
how wide the room is around it. The game: go through mysteries 1 to 26 in order. For each,
work out what it measures, then reveal the name and a point-by-point explanation. Finished? 31 harder ones
(H1–H31) follow.