Logic Masters Deutschland e.V.

Normal Sudoku rules apply. Draw a closed loop of orthogonally connected cells that does not touch itself, even diagonally. The loop must visit all 9 region boxes (numbered 1 to 9 in reading order from top left to bottom right) passing through all non-given cells in each box where the odd/even parity of the cell matches the odd/even parity of the region box. The loop does not pass through the 3 in the centre of the grid.

Cells with grey squares must contain even numbers. Cells joined by an X sum to 10 and those joined by V sum to 5. Digits along marked diagonals sum to the number indicated outside the grid.

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