Multiplication Sudoku: Play Multiplication Sudoku and calculate your IQ

Multiplication Sudoku is a new brain game created by the author of this book on 2015-02-23. It is created in order to develop the mental calculation, reflection, logical skill, computational speed, Processing speed, Intuition, Algebraic calculation, etc. This book contains 12 levels (from extremely easy to the hardest level) of the presented game, and 10 puzzles per level. Solutions are shown at the end of each level. Try to finish as fast as possible the puzzles, you can write your time sc...