A great mind challenging brain game to improve your memory, mental health and wellbeing. More than 300 puzzles 112 Hard, 112 Very Hard, and 112 Extreme with accurate skill levels Number of puzzles per page: 4 Solutions are at the end Big 8.5" x 11" pages with room to work Wide margins to remove pages easily Unique and exclusive content - not repeated elsewhere High quality paper and printing This is volume No.1 of 3 Many more Krazy Carrot Sudoku editions are available Krazy Carrot Committed to helping adults and kids improve their brain function. Learn and have fun!