Release NSObject and stop method call

So my menu is calling the game with this piece of code:

game = [[Game alloc] init];
[self presentModalViewController:memoryTest animated:FALSE];

      

        
        
        
      

    

Then the UIViewController appears with a countdown. The player can return to the menu DURING the countdown. However, when I try to do this, the countdown keeps running and eventually the game starts, it was even thought that the UIViewController was fired (so the UIView disappeared) in the backToMenu method.

[self.parentViewController dismissModalViewControllerAnimated:FALSE];

      

        
        
        
      

    

I tried to release the game object in the viewDidAppear method in the menu, but no luck. I was thinking that I have a "throw" BOOL value, so the countdown can be checked or not, the player is out of the game, but there must be a better way to free the object AND stop all method calls inside it.

Thanks for helping me.

CountDown method:

- (void)countDown {

    SoundEffect *sound = [[SoundEffect alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"tick" ofType: @"wav"]];
    [sound playAndRelease];

    if(self.countDownStep > 0) {
        feedback.image = [UIImage imageNamed:[NSString stringWithFormat:@"countdown%d.png",self.countDownStep]];
        feedback.hidden = FALSE;

        [self performSelector:@selector(countDown) withObject:nil afterDelay:0.8];
    }

    else {
        [self displayMessage:self.startMessage];
        [self.game performSelector:@selector(start) withObject:nil afterDelay:0.8];
        [self performSelector:@selector(hide) withObject:nil afterDelay:0.8];
    }

    self.countDownStep--;

}