Want to exercise your brainpower and have fun at the same time? Then this book is for you. This book introduces you to the amazing world of Calcudoku puzzles. It will help you understand the rules of this puzzle. This book is perfect for players of all skill levels and ages. You will find exciting puzzles, both for beginners and for professionals. The objective is to fill the grid in with the digits 1 through 9 (where 9 is the number of rows or columns in the grid) such that: - Each row contains exactly one of each digit. - Each column contains exactly one of each digit. - Each bold-outlined group of cells (block) contains digits which achieve the specified result using the specified mathematical operation: addition (+), subtraction (-), multiplication (×), and division (