Logic Masters Deutschland e.V.

Normal sudoku rules apply. Digits along the two long diagonals cannot repeat along the same diagonal. Digits in a cell possessing a circle must be odd. Digits in a cell possessing a square must be even. Digits on a green "German Whisper" line must differ by a value of at least 5 from its neighbor(s). Digits on a pink "Renban" line must form a consecutive sequence, but they do not have to appear in order along the line (eg, the numbers could appear in the order 213 and still be valid). A quadruplet circle contains digit(s) that must appear in one of the surrounding four cells. Note: all Renban lines are straight; intersecting Renban lines must be consecutive individually

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