Devilishly Difficult Sudoku

In the world of sudoku there are numerous books full of regular sudoku puzzles, however for the serious sudoku freak there is only one book that will satiate the desire for the ultimate sudoku challenge - Devilishly difficult Sudoku is that book!

In lumea sudoku-ului exista numeroase carti pline de puzzle-uri sudoku obisnuite, cu toate acestea, pentru nebunia serioasa de sudoku exista o singura carte care va satisface dorinta pentru provocarea suprema de sudoku - Sudoku diabolic dificil este acea carte!