Prototyping is one of the most critical skills a game designer can cultivate. The ability to "find the fun" in gameplay design is critical to being a successful designer. In this module we will discuss prototyping of a game. This can then be put in front of players during a playtest, allowing you to better understand if the underlying mechanics, systems and aesthetic are something that players may find engaging. As you work on your 3D Shooter project, you should be playtesting. In this module, you will also finish up the 3D Shooter project, submit it for peer review, and peer review your fellow learners games. Finish the course strong!