I confess, I totally forgot about my own blog schedule, and got this one out in a real hurry. As a result, its turned out really hard. I’ll keep it that way, even if it might border on guesswork. There’s a pattern to be found though, and using symmetry and some visualization, progress can be made, and after that, its fairly easy to finish up (since the pattern’s pretty big, that’s not surprising).
Rated – Hard.