Modular X-Sums
(Published on 7. February 2025, 09:48 by jcgodart)
Rules:
- Normal sudoku rules do NOT apply. Fill in the 9x9 grid with digits, which cannot repeat in any row, column or 3x3 box.
- Modular lines: every three succesive cells along a line must contain numbers forming a full set of residue classes modulo 3.
- Global modularity : every 2x2 square within the 9x9 grid must contain at least a digit of each residue classes modulo 3.
- X-Sums : clues outside the grid equal the sum of the first N digits seen from clue, where N is the first digit seen.
- Black dots separate digits where one is twice the other. White dots separate consecutive digits. Not all dots are necessarilly given.
- Note: any numbers entered outside the grid are ignored for solution-checking purposes.
Play online with Sudoku Pad.
In case you get stuck, here's a video solve.
Solution code: Column 6 (9 digits)
Last changed on on 8. February 2025, 04:04
Solved by SKORP17, Justalilguy, Snookerfan, cryptique, geronimo92, marcmees, AKropki
Comments
on 8. February 2025, 04:04 by jcgodart
Added link to video solve
on 7. February 2025, 20:35 by Snookerfan
Very nice! Because of quite a long solve time, I rated this puzzle hard. Thank you
Last changed on 7. February 2025, 16:04
on 7. February 2025, 14:01 by StefanSch
Which normal sudoku rule do not apply?
jcgodart : it's up to you to discover
