Logic Masters Deutschland e.V.

Rules:

Place the digits 0–9 once each in every row, column, and box. Draw a non-intersecting loop through the centers of some cells which passes through each box exactly once. Orthogonally adjacent cells across a border may not both be unvisited by the loop. Adjacent digits on the loop differ by 5 or more. Digits in a gray, green, or red circle are odd. Digits in a green or red circle equal the number of cells visited by the loop in that box. Green circles are visited by the loop and red circles are not.

Solve:

• SudokuPad