This document discusses HTML5 games for mobile devices and introduces ImpactJS as a JavaScript game engine. It notes that HTML5 is ready for games development today across many platforms due to its cross-device capabilities and performance improvements in modern browsers. ImpactJS is highlighted as a simple game engine that allows developing stunning HTML5 games for desktop and mobile browsers using HTML5 features like Canvas, Audio, and CSS3. A demo of an ImpactJS game is provided to illustrate its capabilities.