Logic Masters Deutschland e.V.

Rules:

Place the digits 1-9 once each into every row, column, and box.

A digit on a circle counts how many digits in the (up to 8) surrounding cells have the same (even/odd) parity as the digit on that circle.

A digit on a square counts how many digits in the (up to 8) surrounding cells have different (even/odd) parity from the digit on that square.

Play on SudokuPad

Have fun solving!