Anti-Sudoku
(Published on 21. June 2021, 14:02 by HawkAvatar)
Normal Sudoku rules do NOT apply.
Each row, column and box has exactly 1 digit repeated twice (equivalently 1 missing digit).
Furthermore, no two rows share a repeat digit nor a missing digit (e.g. if row 1 has 2 2s and 0 9s, then no other row may have more than one 2, and all other rows must have at least one 9). Similarly for columns and boxes.
A web interface for checking a filled anti-sudoku grid is available on github
Solution code: Extra digits in rows 1-9 followed by missing digits in columns 1-9
Comments
on 1. September 2024, 11:58 by wullemuus
Being familiar with Kafkapharnaum's "Doppelganger" puzzles it was a great joy to solve this variant as well (and not too difficult)!
It was very interesting that a special kind of logic about missing and extra digits in rows, columns and boxes as in every standard doppelganger puzzle you used in this puzzle, but not in the Anti-Sudoku Wheel. Do you have an explanation for this?
on 25. August 2024, 05:03 by Kafkapharnaum
https://sudokupad.app/1hqkf36oxt
And here's one for this puzzle as well -- figured since I had the setup all done already, I could as well do this one too. I leave it to your discretion whether you want to have these links on, but one way or another, it'd be great to see more solves on this one as it really deserves it, and clearly those who solved it enjoyed it a lot :D
on 14. February 2022, 01:33 by josemadre
Amazing puzzle, nicely done!
on 21. June 2021, 17:29 by Kafkapharnaum
Great work! I was drawn to this one cause I've actually attempted this concept a few times myself, only I used the digit 0, so if you're interested, you can check my first 3 puzzles -- I named that variant 'Doppelganger', but in fact, I learned that the setter Richard had ALSO came up with something similar, which he called 'Blackout'
