Cripes. 8 puzzle rooms in one building? The “clues” don’t really help either, but luckily one or two are obvious, and the others are made easier by Goombella effectively telling you exactly what to do. Thank god for that, eh?
After that, it’s on to another bit of Shadow Castle thingie, and Gloomtail. Who killed me, as I forgot to heal up before opening a door. Ooops.