If you are unfamiliar with Japanese puzzles, this book is the ideal introduction. Each set of puzzles is preceded by a tutorial which not only explains the rules but also suggests easy-to-follow strategies for solving them. Each set of puzzles are then divided into three sections, namely, 'Childs play', 'A pleasant challenge', 'Difficult for mere mortals'. For the puzzles I hadn't come across before, these were great for developing my skills and I then found I could do the harder puzzles in other books. For those puzzles that I was already familiar with, I found the 'child's play' sections were too easy. So, if you are already experienced in Sudoku, Kakuro, Hitori, Nurikabe, Masyu and Sudoku X, this may not be the book for you. But if you are new to some/all of the above, I would highly recommend it.