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 score at the beginning of each exercise, and calculate your IQ for each level. Instructions: The game is similar to the normal Sudoku in which the objective is to fill a 9x9 grid with digits in void squares, in a way that each row and column in the 9x9 grid contains all the digits from 1 to 9. Moreover, each 3 squares located at the edge of the table must have a multiplication equal to the number above or behind them after the equal symbol as presented at the back cover. This book contains a simple method to calculate your IQ and to figure out what does your score mean.