Logic Masters Deutschland e.V.

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.