These puzzles are an exciting new Sudoku variation made by bending the rows, but not the rules You have to be willing to think outside the familiar box of 81 squares. In fact, there are no squares in these puzzles because there are no straight lines. Instead, the rows and columns form graceful arcs. All the rules of Sudoku still apply - you need to carefully place the numbers 1 through 9 so that every row, column, and box contains one of each number. If you know how to solve Sudoku, you already know how to solve Swirldoku. Volume 2 of Swirldoku contains larger puzzles - twice the size of a standard Sudoku. If you are used to sprinting through your puzzles to try to improve your fastest time, get ready to spend a little longer with these puzzles. They are somewhat like a weekend crossword that you solve at a more leisurely pace than the daily puzzle. So sharpen your pencils and get ready for some fun