Normal sudoku rules apply. Each digit in column 1 indicates the position of the 1 in its row (that is, if R5C1 is a 6, R5C6 is a 1). The same is true of columns 5 and 9, regarding the digits 5 and 9, respectively. Adjacent digits along a green line must differ in value by at least 5. Gold lines contain a non-repeating set of digits, and no two digits on the same line can be consecutive (regardless of their position on the line). Digits in cells with a shaded square must be even.