At its core, PlayStation Mobile is actually a fairly low level SDK, just a small step above OpenGL. As you may have seen in Chapter 1, Getting Started, this results in a rather large amount of code to create 2D graphics, as you are working in 3D. Fortunately, Sony has provided a 2D library for you, GameEngine2D.
If you have ever used the popular Cocos2D library, GameEngine2D will feel immediately familiar, as Cocos2D was the inspiration behind GameEngine. GameEngine2D makes it significantly easier to make a 2D game.