PhysicsJS is an open source, modular, Object-Oriented JavaScript physics engine that I used to make an HTML5 game based off of the 1992 computer game JezzBall. I learned PhysicsJS by reading its online API documentation. This game was developed using mobile first design principles, OOP JavaScript, jQuery, Sass, Illustrator, HTML5, and CSS3. Left mouse click or swipe on mobile to change direction. Can you beat all 5 levels? Click here and find out!