200 Sudoku difficult with solution: 9x9, Puzzle Book, 2 puzzles per page

Sudoku Puzzlebook200 hard Sudoku Puzzle in compact format for on the go, on vacation, at the beach or just passing the time in rainy weather at home. At the end of the booklet there is to each puzzle the solution 200 puzzles Two puzzles per page At the end of the book solutions to all puzzles