CalcuDoku is a fun and addicting logic puzzle game that combines Sudoku with math. CalcuDoku is a fun way for kids and adults to practice addition, subtraction, multiplication, and division facts. This book is ideal for you if you already know how to solve CalcuDoku puzzles but you find our hard CalcuDoku puzzles too difficult. Once you pick up this book, you won't be able to put it back down. You have been warned! CalcuDoku 9x9 - Medium is a collection of 276 puzzles: The goal of CalcuDoku 9x9 is to fill the grid in with the numbers 1-9 such that: I guarantee that every logic puzzle in this CalcuDoku 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. CalcuDoku is also known as Square Wisdom, CanCan, MinuPlu, Mathdoku and Calcu-Doku.