I’m working on lots of different Sudoku variants for my forthcoming book, so I thought I’d post some of them here. On that basis, here’s an Argyle Sudoku puzzle. Just follow the usual rules but also note that you can’t repeat a digit in any of the marked diagonals.
You can now also keep track of this and future puzzles I publish using The Griddle’s puzzle tracking system. The following buttons update the status of the puzzle: