Logic Masters Deutschland e.V.

Antiknight: Any two cells separated by a knight's move in chess cannot contain the same digit.

Nonconsecutive: Any two orthogonally adjacent cells cannot contain consecutive digits.

XV: Digits separated by an X sum to 10, those separated by a V sum to 5. Not all Xs and Vs are necessarily given.

Maximum/Minimum: Cells with outward-pointing arrows are larger than their orthogonally adjacent cells. Cells with inward-pointing arrows are smaller than their orthogonally adjacent cells.

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