Coldulo
(Published on 4. July 2026, 08:00 by Kaktuslav)
Link to SudokuPad: https://sudokupad.app/8spurrnmcc
Rules: Normal sudoku rules apply. The nine marked cells contain the digits 1–9, each exactly once.
Modular columns: If a marked cell contains the digit N, then every vertical group of N consecutive cells in its column has remainders 0, 1, ..., N−1, in some order, when its digits are divided by N. Such a group may start anywhere in the column (it does not need to contain the marked cell). For example, if a marked cell contains 4, then every four consecutive cells in its column have remainders 0, 1, 2, 3 modulo 4, in some order.
Rules: Normal sudoku rules apply. The nine marked cells contain the digits 1–9, each exactly once.
Modular columns: If a marked cell contains the digit N, then every vertical group of N consecutive cells in its column has remainders 0, 1, ..., N−1, in some order, when its digits are divided by N. Such a group may start anywhere in the column (it does not need to contain the marked cell). For example, if a marked cell contains 4, then every four consecutive cells in its column have remainders 0, 1, 2, 3 modulo 4, in some order.
Solution code: Row 8
Last changed on -
Solved by alexsmart, Piff, onlainari, amirs, eladv, Myxo, dorverbin, SKORP17, sorryimLate, Kreekers, widjo, Franjo, MixedMathialArts, arctan, emoney1374, Fool on Hill, SSG, marty_sears, krokozabra, ... bodemeister, Carnate, Jesper, Major314, asynchronous, rerare, redfoot, SXH, fthompson, annnz, kdwji, HonkIfYouLoveBeer, Zeld1, SMM, OGRussHood, danilopiazza, GWilliams00, Klook, guirigui
Comments
on 5. July 2026, 23:36 by marty_sears
Another banger from Kaktuslav! What a fantastic concept, and executed to perfection. Nice aesthetics too
on 5. July 2026, 22:21 by Fool on Hill
Quite remarkable (a) that this solves and (b) that you had the idea that it might.
on 5. July 2026, 13:50 by Franjo
Thank you very much for creating and sharing another extraordinary puzzle. Perfect setting! (I cannot understand why this is rated at less than 90% - should be 100%, of course.)
on 4. July 2026, 12:21 by onlainari
There is so little furniture in this puzzle it’s amazing that it solves.
on 4. July 2026, 09:20 by Piff
Very nice!
