private void gameSPToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmSingleplayer frmSP = new frmSingleplayer();

            if (frmSP.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                diffToolStripMenuItem.Enabled = true;
                Player human    = new HumanPlayer(frmSP.getPlayerName(), frmSP.getPlayerTile());
                Player computer = new ComputerPlayer(-frmSP.getPlayerTile(), frmSP.getDiffLevel());
                controller.changePlayers(human, computer);
                updateP1Label(human);
                updateP2Label(computer);
                controller.resetGame();
                enableButtons();
                restartToolStripMenuItem.Enabled = true;
                diffToolStripMenuItem.Enabled    = true;
            }
        }