Took me an hour to solve the Miracle Sudoku. The Cracking The Cryptic's web interface is really nice, with both number and color tagging, making the process much easier.
I've been using Radicale instead of iCould on my iDevices as well - I can confirm that the collection URL setup worked for both contacts and calendars.
Creating repeating events on Radicale calendar is one of the things that I have varying degrees of success depending on the client I use: it works fine on iOS, but rather finicky in evolution seemingly due to part of CalDav spec being unimplemented.
TIL everytime a Blu-ray drive reads a disc, it updates its Media Key Block (MKB) if it sees a newer version stored on the disc, and that's how my Ultraman Blu-ray essentially bricked my drive (until MKB v70's processing keys and host key/certificate becomes publicly availabe). See how unwanted and forced updates are harmful? I really hope not all media formats are designed with DRM in mind primarily, but it seems that CDs are more the exception than the norm.
I ended up using MakeMKV, which allows media players like VLC to offload decryption to it via the included libmmbd, and it worked like a charm! VLC does support playback from all regions, but I needed to first switch to the appropriate one using Tools -> Preferences -> Show settings: All -> Input / Codecs -> Access modules -> Blu-ray -> Region code (there is built-in search for settings, fortunately).