Cross Sums (also known as " Kakuro") is a logical puzzle with simple rules and challenging solutions. The puzzle consists of a playing area of filled and empty cells similar to a crossword puzzle. This Cross Sums book is packed with the following features: - 100 large print Cross Sums (20x20) puzzles. - Answers to every puzzle are provided. - Each puzzle is guaranteed to have only one solution. Includes free bonus puzzles you can download book (Tons of Sudoku Puzzles for Adults & Seniors) Includes free bonus puzzles you can download book (Word Search With Hidden Message: 102 Puzzles for Adults and Seniors)