Just in case you find yourself with loads of free time because I am not being the good daily blogger, here is something to keep you busy. It is likely the most addictive and challenging puzzle I have attacked in my life. Oh, and in case you don’t have that kind of free time, you can do simpler Sudoku here.

Don’t say I didn’t warn you. (Yes, I am still stuck at 159. I don’t want to talk about it.)