Normal sudoku rules apply. Each of the following constraint types may contain no repeated digits anywhere in the puzzle E.g., if an orange line cell contains a 5, then no other orange line cell in the puzzle may contain a 5. Constraint types: 1) A digit in a grey square is even; 2) A digit in a grey circle is odd; 3) For digits in cells separated by a white dot, one must be one greater than the other; 4) For digits in cells separated by a black dot, one must be double the other; 5) Adjacent digits along an orange line must differ by 4 or more.