Logic Masters Deutschland e.V.

Click on the image to play (on SudokuPad)

Rules:

Normal Sudoku rules apply.

A and B represent two different clue types and numbers to be determined by the solver. One is a Periodic Sum clue and the other is an X-Sum clue. Each ?-clue is at least one of A or B. AB is both A and B.

Periodic Sum: The clue indicates the sum of the first cell seen in its row or column and every Nth cell after, where N is the digit in the first cell. (For example, if r2c1 is a 3, then the digits in r2c1, r2c4, and r2c7 must sum to 19.)

X-Sum: The clue indicates the sum of the first X cells seen in its row or column, where X is the digit in the first cell.

German Whisper: Adjacent digits along a green line differ by at least 5.

Parity: For each pair of adjacent digits along a red line, one digit is even and one digit is odd.