Close Friends
(Published on 2. December 2021, 21:43 by mathpesto)
Comments and ratings are much appreciated. Hope you enjoy!
Rules:
Normal sudoku rules apply.
Odd/Even: A digit in a gray square must be even. A digit in a gray circle must be odd.
Close Friends: A digit in a white square must be friendly. (A digit is said to be "friendly" if it matches its row, column, and/or box number.)
A digit in a white circle must be the number of surrounding friendly digits, not including itself. (In other words, the number of friendly digits that are orthogonally and/or diagonally adjacent to the white circle.)
Not all white squares/circles are necessarily given.
Puzzle:
Solution code: Enter row 7 then column 9 (18 digits, no spaces)
Comments
on 12. June 2023, 23:56 by StephenR
Nice, thanks. Fairly smooth too although I broke it once, I think because I confused squares and circles because I nearly did it again!
on 24. January 2022, 16:40 by alexlovi
Such an incredible build! Took me almost 2 hours of pure amazing logic! Loved this puzzle!!!
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@alexlovi So glad to hear that! -MathPesto
on 18. December 2021, 20:00 by Bankey
WHAT a puzzle ! Requires complete focus. Hats off, mathpesto ! Thanks :-)
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Thanks so much! -mathpesto
on 4. December 2021, 20:18 by henrypijames
So easy to make mistakes, absolute concentration required.
on 3. December 2021, 03:40 by fpac
working out the logic to what touches what was sublime
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@fpac, pleased to hear it! -MathPesto
on 3. December 2021, 02:13 by Steven R
That was quite a challenge! Very nice, but 4* difficulty imo.
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@Steven R, thanks! I changed the difficulty based on your feedback.
