“Jigsaw Sudoku,” implemented elsewhere as “Killer Sudoku.” Instead of having a 3×3 grid of 3×3 squares, there are arbitrarily-shaped “cages” that also have all the 1-through-9 digits without a repeat. Fun. :)
Retired economics professor (“dismal scientist”). Married 40+ years to the love of my life; we have two grown daughters, both married, two granddaughters and a...