After an entire chapter of theory, we have finally reached the chapter where we will be creating a game. I am sure that this is a moment you have been waiting for and your fingers are aching to write some code and make a game.

In this chapter, you will create a small and basic game using SpriteKit. We will see how to create the main menu of the game, and you will learn how to transition from the main menu scene to the gameplay scene, where all of the gameplay code will be written.

In the gameplay scene, we will add sprites, such as the background and hero, first. We will then create a small physics engine to make the hero move around. Then, we will add in the enemies, and move them too. Next, we will make the hero and the enemies shoot at each other. We will detect collision between the hero's rockets and the enemies, and between the enemies' bullets and the hero. For each enemy the hero shoots, we will get one point, but if any of the enemies go past the left of...