In this chapter, we have learned about particle effects and their flexibility in use. We have created enemies and power-ups only with particle effects. We have found out how we can handle contact events and how to use complex physics and collisions in our game. We handled scene transitions and found out how to decouple a node from the scene if needed. Our game is almost fleshed out, we have enemies, power-ups, and lost conditions.
In the next chapter, we will learn how to add game controllers support to our game. We will learn how to discover and use various game controllers that are new in iOS 7.