private void LoadNextModule(int level, int number)
    {
        //validate numbers
        if (number < 9)
        {
            //prep grid
            nextGrid.ClearGrid();

            //file path string
            string file = "Level_" + level.ToString("D2") + "_Module_" + number.ToString("D2") + ".mod";

            //load next module
            nextGrid.LoadNextModule(file);
        }
        else if (number == 9)
        {
            //prep grid
            nextGrid.ClearGrid();

            //file path string
            string file = "Level_00_Module_01.mod";

            //load end module
            nextGrid.LoadNextModule(file);
        }
    }