Open an Xcode project and create a new CCNode subclass called WinLoseDialog. It is better to place this too in the Scenes group in order to keep things more organized.

Open the GameStats.h file and add the timeSpent property; we will use it to count the time that the player spent to beat or lose the level:

@property (nonatomic, assign) float timeSpent;

Open the GameStats.m file and initialize this property to 0 inside the init method:

self.timeSpent = 0;

Open the GameScene.m file and find the update: method. Add the following line, right after the line where we check that the game state is GameStatePlaying:

-(void)update:(CCTime)dt
{
    if...