When you buy this book you get an electronic version (PDF file) of the interior of this book. King-Sized Kakuro Deluxe bundles the biggest and baddest Kakuro puzzles ever. Your brain will work overtime on these colossal logic math puzzles. Kakuro is a fun way for kids and adults to practice addition facts. Once you pick up this book, you won't be able to put it back down. You have been warned! Only 1 Kakuro puzzle per page, with lots of white space for scribbling. King-Sized Kakuro Mixed Grids is a collection of 153 puzzles: 54 Kakuro 19x19 puzzles 54 Kakuro 20x20 puzzles 54 Kakuro 21x21 puzzles 54 Kakuro 22x22 puzzles 54 extra logic puzzles The goal of Kakuro is to insert numbers into the white cells. Possible numbers are always 1 to 9. The sum of each horizontal block must equal the clue on its left. The sum of each vertical block must equal the clue above it. You can only use a number once in each horizontal or vertical block. I guarantee that every logic puzzle in this Kakuro puzzle book has been carefully checked to ensure that each puzzle has only 1 solution. None of the puzzles in this book will appear in any of the other PuzzleBooks.net books. Kakuro is also known as Cross Sums, Kakro, Kakkuro and Cross Addition. Kakuro is also quite often misspelled as Kakura.