This document discusses mobile game development trends from 2001 to 2011. It notes the rise of smartphones after 2007 and the increasing popularity of mobile games. It profiles several game engines for developing mobile games, including GClue, Droidget, Corona, and Unity. Unity is discussed in more detail, highlighting its capabilities for 2D and 3D games, multiplatform support, and use of C# for rapid game development. Statistics are presented on mobile game revenues and popular titles like Angry Birds. The document promotes Unity as a powerful yet accessible game engine.