In Japan they don't do crosswords they do Sudoku. The name itself is an abbreviation of the Japanese phrase 'suuji wa dokushin ni kagiru' meaning 'the digits must remain single'. However, unlike a crossword, you don't need to speak a particular language to solve the puzzle. In fact, you don't even need to know how to count! The attraction of Sudoku is that the rules are extremely simple and yet the line of reasoning required to reach the complete solution may be highly complex. Puzzles are differentiated by their difficulty and in this book you will find puzzles to suit all enthusiasts, from beginners to experts. The public appetite for Sudoku puzzles remains as strong as ever. It has been calculated that the number of possible solution grids for Sudoku is 6,670,903,752,021,072,936,960, so it should be possible to satisfy this hunger for some time to come. In this book you will find 250 of these possible grids, graded in difficulty from very easy to very tough.