Normal sudoku rules apply ie Each row, column, and 3×3 box must contain the digits 1–9 exactly once. A golden dot between two cells indicates that their sum is divisible by 4. ALL possible golden dots are given. Golden dots take precedence over the black dots ie if two cells could have black dot and a golden dot, only the golden dot is shown. A black dot between two digits indicates that one is double the other. Not all possible black dots are given. A white dot between two digits indicates they are consecutive. Not all possible white dots are given. The sum of two adjacent cells separated by a 3x3 box border are even. Note that the sum of two adjacent cells not separated by a 3x3 box border may still be even.