public void RestartGame()
    {
        if (gameController.RestartFlag)
        {
            displayText.SetRestartText(InGameConstantStrings.RESTART);

            if (Input.GetKeyDown(KeyCode.R))
            {
                SceneController scene = new SceneController();
                challenge.ResetDifficult();
                scene.ResetScene();
            }
        }
    }