The FlatRedBall Engine is a 2.5D game engine focusing on ease of use and asset management. Development of the FlatRedBall engine began in early 2002, but the Engine was not available for public download until January 17, 2005. Since then, both the community and the engine have grown considerably. Originally, the FlatRedBall Engine was designed for 2D games, and used the 3D technology for simple effects. However, as the engine has grown, its support for 3D has also improved. Basic 3D games can be developed using the FlatRedBall Engine, although most of its functionality is built with the assumption that the game is 2D. FlatRedBall XNA provides more advanced 3D support. Combined with the FlatRedBall Development Kit, the FlatRedBall Engine can be used to rapidly develop any 2D game and some 3D games. The feature set continues to grow, and the developers are very responsive to user suggestions. We are confident that the FlatRedBall Engine is the easiest to use game engine available.