Calcudoku Puzzle Book

Calcudoku (also known as "KenKen", "KenDoku", "Mathdoku", "Square Wisdom") is a logic puzzle with simple rules and challenging solutions. It is similar to Sudoku and Killer Sudoku except you're dealing with +, -, x and ÷.
This Logic Puzzles book is packed with the following features:
- 500 Calcudoku (6x6) Puzzles from Easy to Hard.
- 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)