From the creators of Lexy and Kaylee's Canine Coloring Book for Children series now have put together an activity book for Adults and Teens. Inside there are 52 advanced 15x15 Kakuro Puzzles in an easy to carry 6 x 9 format. Great for taking with you on plane and train rides or to sit at the beach or by the pool.

Kakuro, called Cross Sums, is a popular numerical logic puzzle with a history closely tied to the broader tradition of pencil-and-paper puzzles. Here's an overview of its history:

Origins: The concept of Kakuro puzzles dates back to the early 20th century. The puzzle resembles a crossword but uses numbers instead of words. The basic idea of combining numbers to fit into a grid in a crossword-like pattern has existed in various forms for many years. The puzzle as we know it today was popularized in Japan, much like Sudoku. The term "Kakuro" itself is derived from the Japanese words "kasan" (to add) and "kurosu" (cross).

Spread and Popularity: Kakuro gained significant popularity in Japan during the latter half of the 20th century. Japanese puzzle magazines and books began featuring these puzzles regularly. The puzzle spread to the Western world in the late 20th and early 21st centuries. Puzzle books, magazines, and online platforms introduced it to a broader audience.

Mechanics: A Kakuro puzzle aims to fill all blank cells in the grid with digits from 1 to 9. Hence, the sum of the numbers in each horizontal and vertical block matches the clue associated with that block, with no repeated numbers in any block. While the basic rules are simple, the puzzles can be easy to extremely challenging, requiring logical deduction and combinatorial skills.

Digital Era: The internet made Kakuro puzzles widely accessible through online puzzle sites and mobile apps. This digital transition helped maintain and even boost its popularity. Kakuro is also used in academic settings to teach arithmetic, logical reasoning, and problem-solving skills.

Cultural Impact: Kakuro has a dedicated following among puzzle enthusiasts. It is often featured in puzzle competitions and tournaments. The puzzle has inspired various variations and adaptations, including larger grids, different numerical constraints, and hybrid puzzles combining elements of Kakuro with other puzzle types.

Kakuro has a rich history rooted in Eastern and Western puzzle traditions. It continues to be a beloved puzzle type enjoyed by many worldwide.