MainWindow.xaml

<Window x:Class="HungGame.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:HungGame"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Border Padding="10">
    <StackPanel>
            <TextBlock Text="Please Select Game Level" Margin="0 10" />
            <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>

            <Button Margin="0 0 10 0" Grid.Column="0" Click="Button_Click">Easy</Button>
            <Button Grid.Column="1" Click="Button_Click_1">Normal</Button>
            <Button Margin="10 0 0 0" Grid.Column="2" Click="Button_Click_2">Hard</Button>
        </Grid>
    </StackPanel>
    </Border>
</Window>