Loopy Parity X-Sums
(Published on 20. July 2024, 02:56 by yttrio)
Rules:
Normal Sudoku rules apply.
Draw a one-cell-wide loop of orthogonally connected cells. The loop may not touch itself, not even diagonally.
The loop acts as a parity line: digits along the loop must alternate between even and odd digits.
Clues outside the grid are loop-cell X-sums. They indicate the sum of the first X digits on the loop in the row or column, where X is the digit next to the clue (and not necessarily on the loop). X cannot be larger than the number of loop cells in the row/column.
Solution code: Cells on the loop in row 9 (left to right) followed by cells on the loop in column 8 (top to bottom)
Comments
on 2. August 2024, 21:40 by mathpesto
Brilliant! Challenging but fair
on 2. August 2024, 10:54 by cat
Great puzzle! It took me a while to solve, though. Not a 3-star for me (more like a 4).
on 22. July 2024, 00:19 by marcmees
very nice. thanks
on 21. July 2024, 13:11 by Franjo
Fantastic puzzle with a very clever constructed break-in. Thank you so much for sharing this lovely gem.
on 20. July 2024, 11:54 by wuc
Tough but adorable puzzle. The loop variant of the X sums together with the parity is used so clever. What a mind bending experience. Thank for sharing.
