NSPredicateWithBlock

BOOL proVersion = YES;
    if (proVersion) {
        return;
    }
    
    //create predicate and filter the results
    NSPredicate *freePredicate = [NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *binding) {
        InAppGame *game = (InAppGame *)evaluatedObject;
        return game.isFree;
    }];
    
    NSArray *filteredArrays = [resultsArray filteredArrayUsingPredicate:freePredicate];

    if ([filteredArrays count] > 0) {
        [self.resultsArray removeAllObjects];
        [self.resultsArray addObjectsFromArray:filteredArrays];
    }