X + X²
(Published on 14. October 2025, 01:25 by RockyRoer)
The Rules:
- [Sudoku] Normal sudoku rules apply -- fill every row, column, and 3x3 box with the digits from 1-9 once each.
- [Lines] Each line must be split into two parts such that the digit(s) on one side of the line must sum to x and the digits on the other side of the line must sum to x². Digits may repeat on lines if sudoku allows.
- Example: A line might be able to be 4-1348, or 238971 because 4² = 1 + 3 + 4 + 8 or (2+3)² = (8+9+7+1).
The Puzzle:
Solution code: The first six digits of column 3 from top to bottom
Comments
on 19. October 2025, 20:41 by Eresus
Really enjoyed this, such a great rule that I haven't seen before, thank you :)
on 17. October 2025, 19:06 by Franjo
After some preparation on paper I enjoyed walking the smooth solving path. How satisfying this was! Thank you very much for creating and sharing another beautiful math puzzle.
on 15. October 2025, 10:03 by sandhinfk
Very interesting math rule and very smooth after the break-in. The lines are perfectly placed in a way which do not need crazy calculations.
on 14. October 2025, 17:37 by flutchman
Pretty approachable for a potentially calculation-heavy rule set.
Very rewarding and fun puzzle, well done.
on 14. October 2025, 05:27 by zardoz37
This is very neat.
on 14. October 2025, 03:13 by mathpesto
Lovely! I learned a lot along the way :)
