Free Preview of 400 CalcuDoku puzzles 9 x 9 + BONUS 250 classic sudoku: Sudoku EASY, MEDIUM, HARD, VERY HARD puzzles and classic Sudoku 9x9 very hard levels
400 CalcuDoku puzzles 9 x 9 + BONUS 250 classic sudoku: Sudoku EASY, MEDIUM, HARD, VERY HARD puzzles and classic Sudoku 9x9 very hard levels