What Am I Missing?
(Published on 15. September 2025, 08:00 by Kaktuslav)
Link to SudokuPad: https://sudokupad.app/v1erdx85gx
Rules: Fill the 8×8 grid with digits 1–9 so that each row and column contains eight different digits, i.e. exactly one digit is missing from every row and every column. Moreover, no two columns are missing the same digit (note there is no similar assumption about rows). On vertical lines, adjacent digits must sum to the digit missing from that column. On horizontal lines, adjacent digits must differ by the digit missing from that row.
Rules: Fill the 8×8 grid with digits 1–9 so that each row and column contains eight different digits, i.e. exactly one digit is missing from every row and every column. Moreover, no two columns are missing the same digit (note there is no similar assumption about rows). On vertical lines, adjacent digits must sum to the digit missing from that column. On horizontal lines, adjacent digits must differ by the digit missing from that row.
Solution code: Negative diagonal (top-left to bottom-right, no spaces)
Last changed on on 15. September 2025, 12:23
Solved by sanabas, clock, dr_nectar, Sollun, tiuhto, SKORP17, sze, IcyFruit, 5381, Debrutsid, Exigus, welgen, zrbakhtiar, MixedMathialArts, geftus, RedBarchetta, paranoid, Krisonium, drf93, mir85, karlmortenlunna, QuiltyAsCharged, Ton, abysszealot, Lussie, koXx, Crulamin, wormbrain, phoegon, kasperd, knight_gx, widjo
Comments
on 8. June 2026, 02:20 by kasperd
This puzzle is a lot easier once you read the rules correctly.
For the longest time I thought the difference rule applied in both directions. And I didn't understand how this could be rated any less than five stars for difficulty.
on 16. September 2025, 16:10 by Exigus
Very interesting concept, not too hard with a bit of goodliffing. Thanks!
on 15. September 2025, 12:23 by Kaktuslav
Emphasizing that there is no assumption about rows
