Logic Masters Deutschland e.V.

Rules:

Normal Sudoku rules apply.

Draw a one-cell-wide loop of orthogonally connected cells. The loop may not touch itself, not even diagonally. Whenever the loop travels vertically, the northern digit is greater than the southern digit. Whenever the loop travels horizontally, the eastern digit is greater than the western digit.

The loop cannot pass through a cell containing a circle, and cells containing a circle count the number of loop cells they touch (both orthogonally and diagonally).

Sandwich Sum: The 21 clue above column 9 indicates that the digits between 1 and 9 in the column sum to 21.

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