Книга "The Harder They Come | Sudoku Difficult Puzzles (240+ Puzzles)".When faced with difficult Sudoku puzzles, think that it's all just numbers. You don't need prior knowledge to play and solve the game. It even has nothing to do with math because you will not be solving any complex equations. So don't get intimidated with the boxes and the numbers. Look at the puzzles, see the patterns and form your own conclusions. Good luck! Это и многое другое вы найдете в книге The Harder They Come . Sudoku Difficult Puzzles (240+ Puzzles) (Puzzle Therapist)