Logic Masters Deutschland e.V.

Normal sudoku rules apply.

Draw a 1-cell wide snake through the grid, where the head and tail of the snake are the shaded cells provided. The snake must enter every cage at least once, and must not touch itself orthogonally (but may touch itself diagonally).

The snake acts both as a German Whisper line (i.e. adjacent digits along the snake must differ by at least 5) and a Zipper line (i.e. a pair of digits an equal distance from the centre of the snake must add to the same total as the centre digit(s)).

A circle in the grid indicates that 'X' cells within that box must be on the snake, where 'X' is the digit in the cell.

A cell containing a black arrow gives the number of cells in the next section of snake seen in that direction. A cell containing a red arrow gives the number of cells on all sections of snake seen in that region. A cell containing multiple arrows provides the number of snake cells seen in all indicated directions cumulatively. Arrow cells may or may not on the snake, but do not count themselves if they are on the snake.

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