This hands-on guide covers both game development and design, and both Unity and C#. Written by an instructor who helped pioneer America's #1 university game development program at USC, this guide illuminates the basic tenets of game design and presents a detailed, project-based introduction to game prototyping and development, using both paper and the Unity game engine. Jeremy Gibson presents prototyping as a core game design skill (much as sketching is a core artist's skill), taking a straightforward, commonsense approach that has been refined over many years of teaching beginners. Throughout, students are encouraged to experiment on their own, and to discover that most problems have multiple solutions.