This great book contains 600 fun and hard Sudoku puzzles that are perfect for brainiacs who want to keep their mind active. Check the sample puzzle on the back cover for an example of difficulty. Packed with puzzles in a 8.5 x 11 inch book. 12 puzzles per page with solutions overleaf With all the solutions on the next page, the pages are easy to cut out and share with friends and family! This is not a large print book. For an alternative large print version, check out Huge Print Hard Sudoku book by Cute Huur. Or even Huge Print Extra Hard Sudoku or Huge Print Ultimate Sudoku.