Normal sudoku rules apply. Digits a king's move (in chess) apart must be different. Adjacent digits on a green line differ by at least 5. Digits on a purple line do not repeat and are a set of consecutive digits in any order. On a black dot, one digit is double the other. Red cells indicate the position of the cell's column number in that row, e. g. a 4 in r6c3 implies a 3 in r6c4.