private void btnHard_Click(object sender, EventArgs e)
        {
            frmLevel1 level1 = new frmLevel1("hard");

            level1.Show();
            this.Dispose();
        }
        private void btnMedium_Click(object sender, EventArgs e)
        {
            frmLevel1 level1 = new frmLevel1("medium");

            level1.Show();
            this.Dispose();
        }