Normal 9x9 Sudoku rules apply. Blockers: Digits in diamonds can never be used on a different clue type than the clue type the diamond lives on. Renban: Digits on a purple line form a set of consecutive digits in any order. Dutch Whispers: Two adjacent digits on an orange line must differ by at least 4. German Whispers: Two adjacent digits on a green line must differ by at least 5. Region Sum: The 3x3 box border divide blue lines into segments; each segment along an individual line must have the same sum.