Normal sudoku rules apply. The cell marked with a blue diamond contains an even digit, while the cell marked with a red diamond contains an odd digit. Two cells marked with yellow squares must contain the same digits; similarly, two cells marked with yellow circles must contain the same digits. Digits along an arrow sum to the digit in the attached pink circle. The sum of the digits along the pink line that connects the two pink circles must equal to the sum of two digits in both circles. Within a cage, digits sum to the small number written in the top left of that cage. Along the green line, two adjacent digits have the difference of at least 5. The 3x3 box borders divide the thicker grey line into smaller segments with the same sum of digits along each segment.