Normal sudoku rules apply. A clue outside the grid gives the sum the digits between the 1 and 9 in that row/column. Cells separated by a white dot are consecutive. On a black dot, one digit is double the other. Adjacent digits along a green line differ by at least 5. Adjacent digits along a red line include one odd and one even. Digits in a cage sum to the total given. The grey line reads the same in both directions.