Sharpen your pencil and get ready to boost your brain with this brand-new numbers game. To solve each puzzle, fill the 16 cells with the numbers 1 to 16 using each number only once. Each puzzle has just one solution, and uses math you learned in grade school: addition, subtraction, multiplication, and division. The games, which all call for logic, imaginative thinking, intuitive elimination, and sheer persistence, are grouped in three categories, and range from relatively simple to super-challenging. The author's spirited instructions and sample puzzles walk you through the basics; clues for some puzzles provide what might be necessary encouragement. With 14 bonus puzzles aimed at children and those who want to start with the ultra-easy, these 150 puzzles will keep you thinking whether you're a student honing your math skills, a puzzle-lover looking for a challenge, or someone who just wants to get those brain synapses snapping! AUTHOR: Michael Polaski has been an information systems analyst and software developer his entire career. His interest in numbers puzzles led him to put those skills to work to create the puzzles used in this book.