Logic Masters Deutschland e.V.

Zhōngguó Ěryǔ

Rules:

Normal sudoku rules apply. Draw one loop in the grid that travels orthogonally, doesn't branch, and isn't allowed to touch itself, not even diagonally. For each box N, either there are exactly N cells that are part of the loop or there are exactly N cells that are not part of the loop. Adjacent digits on the loop must differ by at most 2. If there are exactly X cells on the loop in a box, then digit X is on the loop in that box. Orthogonally adjacent digits can't be consecutive if one is on the loop and the other is not on the loop. Digits separated by a black dot must be in ratio 1:2. Not all dots are necessarily given.

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