Logic Masters Deutschland e.V.

Normal Sudoku rules apply. Place the digits 1-9 in each row, column and box without repetition.

Quadruples: Digits in the white circle must appear in at least one of the four surrounding cells.

Anti-Quadruples: Digits in the light red circle cannot appear in one of the four surrounding cells.

Bipolar Quadruples: In the yellow circle of the four digits, two digits cannot appear and the two other digits must appear in any of the four surrounding cells.

Solve CTC