Logic Masters Deutschland e.V.

Solve in SudokuPad

Normal sudoku rules apply.

Draw an orthogonally connected loop that does not branch, overlap or touch itself. Every cell on the loop indexes a different cell in the grid and they are the same digit (no loop cell indexes itself). If a loop cell is in RaCb then it indexes R(a+b)C(a*b). If the sum or product exceed 9, then add the digits repeatedly until a single digit remains.

Arrows are off the loop and count the number of loop cells in the indicated direction.

Adjacent digits on a green line differ by at least 5. A white dot between 2 cells means they are consecutive. An inequality sign points to the smaller digit.