Dutch Flat Mates: Periodic Sums (with sujoyku)
(Published on 12. November 2025, 09:00 by Sotehr)
Play [Dutch Flat Mates: Periodic Sums] on SudokuPad.
Dutch Flat Mates: Every 5 in the grid must have a 1 directly above it, or a 9 directly below it. It may have both, but it isn't necessary.
Periodic Sums: A clue outside the grid indicates the sum of the first cell seen in its row or column and every Nth cell after, where N is the digit in the first cell. For example if r7c1 is a 3, then the digits in r7c1, r7c4, and r7c7 must sum to 18.
NOTES
Many thanks to sujoyku for setting this with me, and Flinty for allowing me to make my debut in his Dutch Flat Mate series! He has been releasing a flatmate every week since '18 Oct 23!' There is a spreadsheet link for all the previous puzzles in the series, which sometimes has teasers for upcoming constraints and guest setters in the series.
This alternative link offers a limited LMD search for Dutch Flat Mates.
Solution code: Column 6, top to bottom.
Comments
on 12. November 2025, 20:25 by sujoyku
Thank you for this fun collab, Sotehr!
on 12. November 2025, 19:51 by da-hans
Nice addition to the series. Not too difficult.
on 12. November 2025, 17:44 by Franjo
Thank you very much for creating and adding this lovely puzzle to the DFM-series.
on 12. November 2025, 17:26 by ketchup_monster
Lovely construction. Break in was fun, and the solve had a punch right till the end. Great stuff!
on 12. November 2025, 13:56 by Flinty
Lovely stuff :) Thank you. x
on 12. November 2025, 13:09 by Snookerfan
Very nice! Periodic sums are new to me, so I made probably every mistake possible by not thinking them through properly at first. After I put my thinking hat on, it was an entertaining and approachable solve. Thank you
