Normal Sudoku rules apply.
Anti-knight rules apply (no digit can repeat within a chess knight's move).
Digit 8 is a raging knight: can't be within a knight's move of 7,8 or 9.
F-Puzzle (does NOT consider the extra rule):
Solution code: Row 2, Row 8
Please note: The German version of this page has changed. It is possible that this page does not contain the latest information.