Logic Masters Deutschland e.V.

Normal sudoku rules apply. XV, Kropki, Renban, and Arrows are calculated modulo 9:

• Two digits separated by an X must sum to 10.
• Two digits separated by a V must sum to either 5 or 14.
• Two digits separated by a white dot must be consecutive; 1 and 9 are consecutive.
• Two digits separated by a black dot must be in a 1:2 ratio modulo 9, meaning that one digit multiplied by 2 must be equal to either the other digit or the other digit plus 9. For example, 5 and 1 can be separated by a black dot, because 5 x 2 = 10 = 1 + 9.
• A purple Renban line contains a set of consecutive digits in any order. For example, 192 is a valid modulo-9 Renban line.
• A digit in a circle must equal the sum of the digits on the attached arrow minus some whole multiple of 9 (0, 9, 18, etc).

Online solver: SudokuPad