Normal sudoku rules apply. Every group of 3 cells along a teal line must contain one digit from each modulo 3 group (1, 4, 7), (2, 5, 8), and (3, 6, 9). A digit in a circle counts the number of odd digits on its line. A digit in a square counts the number of even digits on its line. A clue outside the grid gives the sum of the digits along the indicated diagonal.