Normal sudoku rules apply. Cells separated by a single knight's move (in chess) cannot contain the same digit. For all rules below: Do not duplicate any digit within a ruleset. For example, if 1 appears on Renban line, it must not appear on any other Renban line. Renban (purple line): Digits along a purple line form a set of consecutive digits in any order. Thermometer: (thicker grey line) Digits along a thermometer increase from bulb to tip. Kropki dots: Digits in cells joined by a white dot are consecutive. Killer: Digits in a cage may not repeat.