Logic Masters Deutschland e.V.

CTC app link

Rules:

• Normal sudoku rules: Place the digits 1-9 once each in every row, column, and 3x3 box.
• Multipliers: Each 3x3 box contains a circled digit, which is equal to the multiplier of that box. The multiplier applies to all cells of the box it lies within. All multiplier digits are unique.
• The value of each cell is equal to the digit placed in the cell multiplied by the multiplier of its box.
• Super whisper: On red lines, adjacent values must differ by at least 25.