Here are the updates, by the way. Quite a few of the puzzles this week are very challenging, so consider yourself warned!
Monday (Extra Regions, Fred)
Tuesday (Anti-Diagonal Sums, Prasanna)
Wednesday (Pointing Evens, Bastien) - this is a delightfully simple-yet-subtle variant, by the way.
Thursday (Argyle, Rishi)
Anyhow, one of the few benefits of being ill and retired to bed by the early evening is that I have plenty of time to put together puzzles. On the other hand, I'm not necessarily in such a great condition to solve or grade how difficult puzzles really are. Still, this puzzles has plenty of the sort of logic that I would judge makes an analogous classic puzzle a hard puzzle, so I shall stick with my guns on this one. Enjoy!
#231 Diagonal Sudoku – rated mediumAll puzzles © Tom Collyer 2009-13.