void Update()
    {
        /*	if (player.transform.position.x < leftBoundary)
         *              player.transform.position = new Vector3 (leftBoundary, player.transform.position.y, player.transform.position.z);
         *
         *      if (player.transform.position.x > rightBoundary)
         *              player.transform.position = new Vector3 (rightBoundary, player.transform.position.y, player.transform.position.z);
         */
        keyCounter.text  = keys + "/" + totalKeys;
        coinCounter.text = coins + "/" + totalCoins;

        if (player.gameOver)
        {
            GameOver();
        }

        if (gameOverMenu.activeSelf)
        {
            UpdateRevives();
        }

        if (ds.revives == 0 && UnityAds.AdAvailable())
        {
            watchAd.interactable = true;
        }
        else
        {
            watchAd.interactable = false;
        }

        if (ds.revives > 0)
        {
            revive.interactable = true;
        }
        else
        {
            revive.interactable = false;
        }

        if (player.victory)
        {
            Victory();
        }
    }