: Hand-crafted levels by Simon Anthony and Mark Goodliffe .
: A digit cannot be in any of the eight adjacent cells (a king's move). Chess.Sudoku.Update.28.07.2020.rar
: At least one digit (typically 9) must not see another instance of itself along any horizontal, vertical, or diagonal line. Content of the Update : Hand-crafted levels by Simon Anthony and Mark Goodliffe