4 bits Sudoku (hard version)
(Published on 28. March 2020, 22:08 by stephane.bura)
This puzzle was inspired by the very elegant board game Quarto!
This is a harder version of this puzzle.
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General Rules: Place a digit from 1-9 into each cell of the grid so that every row, column and outlined 3x3 region contains each digit exactly once. Unique Cages: Each of the 16 two by two cages is a unique arrangement of odd and even digits (without taking their values into account, only their parities). This means, for instance, that there is only one copy of a cage containing only even numbers, and only one containing only even numbers in its left column and only odd numbers in its right column.
Cages Sameness: A number between two cages indicates how many odd and even digits are in the same position in both cages (without taking their values into account, only their parities). Cage Sums: The number in the center of a cage is the sum of either its odd digits or its even digits. |
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Solution code: Row 8, followed by row 9.
Comments
on 1. September 2025, 14:12 by rich_27
Similarly to the other version, I made it on sudokupad in case anyone else wants to solve it there: https://sudokupad.app/x8tbkrt3mu
(and the f-puzzles compressed link for editing: https://f-puzzles.com/?id=2d3mtza8)
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Thanks rich_27! :)
on 3. October 2020, 20:05 by stephane.bura
Added link.
on 18. June 2020, 18:20 by glum_hippo
I am grateful for Timwi's comment and agree it should be left unhidden
on 24. May 2020, 10:51 by Timwi
Is my comment really something that should be hidden? I think solvers should know this so they can make an informed decision on which of the puzzles to try first.
on 13. April 2020, 20:13 by Rollo
Timwi, please hide your comment.
on 10. April 2020, 11:44 by ch1983
I solved both versions with some time in between and didn't even realize that they describe the same Sudoku (until I read this comment).
on 10. April 2020, 08:42 by stephane.bura
Sorry if I wasn't clear, Timwi. It is just a variant that I posted on the same day as the easier one.
on 9. April 2020, 19:50 by Timwi
I solved the easy version first and then found out that this one has the exact same solution. Keep this in mind when you decide which puzzle to attempt.
