by Nick Snels (Author)

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 love to solve difficult CalcuDoku puzzles no matter their size. You do not need to wade through tons of easy CalcuDoku puzzles before getting to the real brain teasers. You will experience extremely hard CalcuDoku 7x7, CalcuDoku 8x8 and CalcuDoku 9x9. You get the perfect mix of different sizes of CalcuDoku to keep you entertained for weeks. Once you pick up this book, you won't be able to put it back down. You have been warned

CalcuDoku Mixed Grids - Hard is a collection of 276 puzzles:

• 72 hard CalcuDoku 7x7 puzzles
• 72 hard CalcuDoku 8x8 puzzles
• 72 hard CalcuDoku 9x9 puzzles
• 60 extra logic puzzles

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 PuzzleBooks.net books.

CalcuDoku is also known as Square Wisdom, CanCan, MinuPlu, Mathdoku and Calcu-Doku.