Kakuro is a fun way for kids and adults to practice addition facts. This book is ideal for beginners to learn Kakuro. Once you pick up this book, you won't be able to put it back down. You have been warned!King-Sized Kakuro 21x21 Deluxe is a collection of 249 puzzles: 216 Kakuro 21x21 puzzles 33 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 English PuzzleBooks.net books.Kakuro is also known as Cross Sums, Kakro, Kakkuro, Cross Addition. Quite often Kakuro is misspelled as Kakura.