SUDOKU - schwer bis sehr schwer 2

This mix perfectly hits the mark for all those who are not tackling a difficult Sudoku for the first time! Sorting and weighting four closely related difficulty levels from hard to very hard is a high art, and the fans' call for a sequel to Volume 43 was almost impossible to ignore. Here come 500 fresh and previously unpublished Sudokus that will make the heart of every connoisseur race.