Out of Touch
(Published on 22. August 2026, 17:33 by varepsilon)
Link to SudokuPad: https://sudokupad.app/8yy1xpblxs
Normal Sudoku rules apply: Place the digits 1–9 exactly once in every row, column, and 3×3 box.
Draw a single closed loop that moves orthogonally through cell centers. It must leave exactly nine cells unvisited and visit every other cell exactly once.
The nine unvisited cells contain 1–9 once each, with no two in the same row, column, or box. A cell is unvisited if and only if its digit equals its position within its box.
The loop can be divided into nine consecutive 8-cell sections, each containing eight different digits. For each section, the unvisited cell containing its missing digit may not share an edge with any cell in that section.
Normal Sudoku rules apply: Place the digits 1–9 exactly once in every row, column, and 3×3 box.
Draw a single closed loop that moves orthogonally through cell centers. It must leave exactly nine cells unvisited and visit every other cell exactly once.
The nine unvisited cells contain 1–9 once each, with no two in the same row, column, or box. A cell is unvisited if and only if its digit equals its position within its box.
The loop can be divided into nine consecutive 8-cell sections, each containing eight different digits. For each section, the unvisited cell containing its missing digit may not share an edge with any cell in that section.
Solution code: Digits in row 2 cells where the loop turns, read from left to right.
Last changed on on 23. August 2026, 04:27
Solved by Zzzzz..., steeto, lmdemasi, FakeCristiano, kublai, Spillo, Gnosis66, han233ing, Myxo, goodcity, zzw
Comments
on 25. August 2026, 21:49 by Myxo
Brilliant!
on 25. August 2026, 05:08 by Gnosis66
This was a very clever & challenging puzzle. It was also distinctive. I’ve never seen anything like these constraints before.
on 23. August 2026, 13:22 by lmdemasi
This was a really enjoyable puzzle. The initial portion was really interesting, and the scanning in the second half was quite challenging but always fair.
on 23. August 2026, 04:27 by varepsilon
Updated the solution code to reflect which cells are on the loop.
