This TOP SECRET sudoku has had all its digits redacted. Every redaction is either a Renban, German Whispers or Anti-Factor line. All I can tell you is that row 1 uses exactly two Renban lines, and every other row, column, and 3x3 box uses at least two different types of line. Digits along a Renban line form a set of non-repeating consecutive digits in any order. Consecutive cells along a German Whispers line contain digits which differ by at least 5. Digits along an Anti-Factor line of length n may not be any multiple or factor of n (other than the digit 1), and must sum to a multiple of n. eg a line of length 4 could not contain 2,4 or 8 (but could contain 1).