One day the child start games in order to rest his mind while solving math problems. I decided to write this book at that time. It is not something started just recently and not only for children that math, physics are hard, boring subjects and games are just fun. We often see that students blindly memorize a scientific formula like parabola formula, kinetic formulation. And they are moaning like this way, "Where can I use that kind of formula?" And then, they just have fun at a catapult game like 'Angry Birds'. Boys and girls give an exclamation of joy, "How does a clever genius create these funny games?" If I explain hidden principles of mathematics, physics in games, is it possible that children enjoy hard and boring mathematics and physics? If student try to understand mathematics and physics in order to develop a game, they are familiar to science. It brings me to write this book.