Internal X-Sum Modular Loop
(Published on 5. April 2025, 01:52 by yttrio)
This is my third puzzle using the internal loop x-sums. The previous puzzles in this series are linked to below:
Internal X-Sum Whisper Loop
Internal X-Sum Entropic Loop
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 modular line. Each set of three adjacent digits along the loop must be one each from the sets [147], [258], and [369].
Cells with an arrow clue act as internal loop x-sum clues: a digit in a clued cell indicates the sum of the first X digits on the loop in the indicated direction, where X is the digit in the first loop cell in that direction (not including the clued cell itself). X cannot be larger than the number of loop cells in the indicated direction, and the clued cell may or may not be on the loop.
Solution code: Digits on the loop in row 7 (left to right) followed by digits on the loop in column 7 (top to bottom)
Comments
on 19. April 2025, 00:22 by wuc
2.5* to me. I love a good loop puzzle. Great fun thx.
on 7. April 2025, 02:13 by waffles_the_dog
Enjoyable puzzle and interesting logic, thanks! :D
on 6. April 2025, 14:38 by Franjo
Another excellent episode. Now I must have a look at the pilot… Thank you very much for creating and sharing this wonderful puzzle.
on 6. April 2025, 11:44 by Snookerfan
Very nice, as is the whole series! Thank you
on 5. April 2025, 13:53 by mihel111
Lovely. Very well set. Good consistency in difficulty level.
