Logic Masters Deutschland e.V.

Chaos construction: Divide the grid into 6 orthogonally connected regions. Put the digits 1 to 6 once each in every row, every column, and every region.

Unique regions: No two regions have the same shape. Two regions have the same shape if one can be rotated onto the other; mirror images are different shapes.

Consecutive knight: Any two cells that belong to the same region and are separated by a knight's move in chess must contain consecutive digits.

Kropki dots with region clues: Any two cells joined by a white dot belong to different regions and must contain consecutive digits. Any two cells joined by a black dot belong to the same region and must contain digits with a ratio of 1:2 (one must be double the other). Not all dots are necessarily given (no negative constraint).

Play in SudokuPad.