Quiet Investigation
(Published on 12. September 2025, 08:51 by oskode)
Rules:
- Sudoku: Fill all rows, columns and marked 3x3 regions with the digits 1-9 without any repeats.
- Anti-Knight: Cells separated by a knight’s move in chess may not contain identical digits.
- German Whispers: Adjacent digits along a green line have a minimum difference of 5.
- Palindromes: Digits along a grey line read the same from either direction.
- Black Kropki: Digits separated by a black dot are in a 1:2 ratio.
Click here to play online!
Ratings and comments are very much appreciated. Thank you for playing!
Solution code: The digits in column 9, from top to bottom
Solved by by81996672, Piff, Felis_Timon, Simon Yuan, dickey, Fizz, LabRat, dkfan9, jalebc, pseudoku, jadezki, Zibl, Kigor, Joyofrandomness, SKORP17, giladooshlon, briansometimes, brimmy, jnmh, Graphael, NicoD, ... BenClancy, Cliff, mcs131313, mezkur7, Black_Doom, Ye Nay Myo Han, bcreturnee, karlmortenlunna, dogfarts, AN_not_IO, Shmartus, JMK, Prime28, Corey115, joelth, QuiltyAsCharged, Ftown778, Janie
Comments
on 13. May 2026, 11:31 by Prime28
Great puzzle! I got tangled up in my own colouring, lettering, and numbering, so it was a real relief when everything finally clicked into place.
on 15. September 2025, 09:37 by snuuba
Quality time with my crayons, many thanks
on 13. September 2025, 20:40 by Exigus
Really nice use of the constraints. Loved it. Thanks!
on 12. September 2025, 22:53 by briansometimes
A colorado puzzle with my favourite restrictions, what a treat!
on 12. September 2025, 19:26 by Zibl
Great puzzle! Thank you!
