Logic Masters Deutschland e.V.

Normal sudoku rules apply.

Kropki: Two cells separated by a small white dot contain consecutive digits.

Quads: Every large white circle contains exactly 1 digit (to be determined), which is different for each circle. This digit must appear within the 2x2 region that the circle is centred on.

QuadroKropki: Let the digit in a Quad clue be 'n'. Each large circle also acts as a 'diagonal n-kropki' for the 2x2 region centred on it.

Across one 2x2 diagonal, it acts like a black n-kropki (where one digit is 'n' times the other). Across the other diagonal, it acts like a white n-kropki (where the difference between the two cells is 'n').

For example, a potential QuadroKropki option would be:

19
63

Here, 3 would be the digit in the quad circle. 1 and 3 would be the black n-kropki diagonal (as 3 is three times larger than 1), while 6 and 9 would be the white n-kropki diagonal (as the difference between 6 and 9 is 3).

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