This is a very simple book, needing little explanation: This book contains 300 Sudoku Puzzles, all on the same level - the Very Hard-level Sudokus (five out of six level of difficulty) for your fun, and we named them "Very Hard!" OK, I know that's not world-shaking, but we wanted the difficulty level of these puzzles to be easy to identify. The booklet is conveniently sized at 8.5" X 11", so you have plenty of room to write and figure. The puzzles themselves are in LARGE PRINT, while the answers are in smaller print (9 to a page) to keep the number of pages manageable and costs to you down. So, sit down for a long evening, bring it with you wherever you go, or just enjoy it at home whenever you can take a moment's rest, to work on these Very Hard Sudoku Puzzles! This series of books comes in ten volumes, so if you enjoyed this volume, please come back to Puzzle Barn Press, either by clicking on the author link in this book's sale page, or go to PuzzleBarnPress.com, where we showcase all our different volumes (we add new books nearly every day!). You will never run out of puzzle material with Puzzle Barn Press! One of the great things about our Sudokus - in fact, all our puzzles - is that every single one of them is generated on the fly, not pulled from some static database where many people have access. Given the possible combinations of numbers, It's highly unlikely you will ever see any Sudoku puzzle like any other in these books.