Make a Memory game using Apple's SpriteKit

I have made games using various versions of cocos2d, but I wanted to take a look at how Apple’s SpriteKit game framework works. In this tutorial I will take you through a simple memory game I made to test out SpriteKit. Our game will contain a grid of 9 colored circles. The circles will light up randomly in a sequence, then let the player repeat the sequence. The game will then add on to the sequence each time the player successfully repeats it. »