private void btn2_Click(object sender, RoutedEventArgs e)
        {
            Window level2 = new Level2();

            this.Close();
            level2.Show();
        }
        async void Level1_Loaded(object sender, RoutedEventArgs e)
        {
            var colors = new Tuple <char, Color>[9]
            {
                Tuple.Create('R', Colors.Red),
                Tuple.Create('G', Colors.Green),
                Tuple.Create('B', Colors.Blue),
                Tuple.Create('C', Colors.Cyan),
                Tuple.Create('M', Colors.Magenta),
                Tuple.Create('Y', Colors.Yellow),
                Tuple.Create('K', Colors.Black),
                Tuple.Create('P', Colors.Pink),
                Tuple.Create('O', Colors.Orange)
            };
            var combo = new Tuple <char, Color> [9];
            var rnd   = new Random();

            for (int i = 0; i <= 8; i++)
            {
                combo[i] = colors[rnd.Next(0, 8)];
            }

            for (int i = 0; i <= 8; i++)
            {
                EnableButtons(false);
                for (int j = 0; j <= i; j++)
                {
                    grid.Background = new SolidColorBrush(Colors.White);
                    await Task.Delay(500);

                    grid.Background = new SolidColorBrush(combo[j].Item2);
                    await Task.Delay(500);
                }
                grid.Background = new SolidColorBrush(Colors.White);
                inputCombo.Clear();
                int answerTime = 1500 + 500 * i;
                count = answerTime;
                Countdown.Start();
                EnableButtons(true);
                await Task.Delay(answerTime + 500);

                int inputLength = inputCombo.Count;
                if (inputLength != i + 1)
                {
                    i--;
                    continue;
                }
                for (int z = 0; z <= inputCombo.Count - 1; z++)
                {
                    if (inputCombo[z] != combo[z].Item1)
                    {
                        i--;
                        break;
                    }
                }
            }
            await Task.Delay(1000);

            lblTimer.Content    = "Congratulations!";
            lblTimer.FontSize   = 48;
            lblTimer.Foreground = Brushes.White;
            grid.Background     = Brushes.Lime;
            await Task.Delay(5000);

            Window level2 = new Level2();

            this.Close();
            level2.Show();
        }