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[jbullfrog]

Ok, one small step for my app, one big step for me!

After thinking some more I solved my issue! I wasnt declaring the NSUserDefaults in the .h, so I set this in the ViewController.h

NSUserDefaults *prefs;
@property (nonatomic, retain) NSUserDefaults *prefs;

and in the ViewController.m

- (void)viewDidLoad {

	self.prefs = [NSUserDefaults standardUserDefaults];
	
	// Check to see what was stored in the user prefs, and update the label with that colour.
	if ([prefs stringForKey:@"high_score"]) {
		NSLog(@"The prefs is set.");
		high_level.text = [prefs stringForKey:@"high_score"];
	}

	high_level_value=[[NSUserDefaults standardUserDefaults] integerForKey:@"high_score"];
	NSLog(@"set high level");
	
	
	UIApplication *app = [UIApplication sharedApplication];
	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillTerminate:) name:UIApplicationWillTerminateNotification object:app];
	NSLog(@"check close high level");
 [super viewDidLoad];
}

	 - (void)applicationWillTerminate:(NSNotification *)notification
	{
		
		//Save data here
		[[NSUserDefaults standardUserDefaults] setInteger:[high_level.text intValue] forKey:@"high_score"];
		
		[[NSUserDefaults standardUserDefaults] synchronize];
		NSLog(@"app quit, save high level");
	}

Thanks for all the help