Region Prime Line I
(Published on 31. August 2026, 12:23 by PianoForte)
A new twist to my series of prime constraint puzzles...
Region Sum lines with Prime Constraint
Rules:
- Normal Sudoku rules apply.
- Box borders divide region prime lines into segments of equal sum.
- That sum is always prime but may vary for different lines.
- Adjacent digits within those segments must add to a prime number.
To clarify: This does not apply across box borders, but does apply to both, orthogonally and diagonally adjacent digits on each line segment within a box. - Squares mark cells with even digits, cirlces those with odd digits.
Play online on Sudokupad
Solution code: Row 1 from left to right
Solved by miranda_9, SKORP17, kangaroo, palletpusher
Comments
on 20. September 2026, 07:05 by palletpusher
Quite enjoyed this very nice puzzle, PianoForte; thank you for sharing!
I must have missed the 2* solution path, but in retrospect I did spend the first thirty minutes taking notes about which digits formed valid 2– and 3-sequences. Then partway into the solve I had to restart when I noticed 13 ≠ 11.
