How to show the original form after hiding it to pop up another form?

Question

I created a form which, when a specific button is clicked, pops up another form and hides itself. I don't now how to make it pop back up anymore, and I am trying to figure it out. Button click code:

BlackJack game = new BlackJack();
private void Button1_Click(object sender, EventArgs e)
{
    this.Hide();
    game.Show();
}

Main function code:

static void Main()
{
    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);
    Application.Run(new Start());
}

2nd form closed event handler:

public BlackJack()
{
    InitializeComponent();
    this.FormClosed += new FormClosedEventHandler(game_FormClosed);
}
void game_FormClosed(object sender, FormClosedEventArgs e)
{

}