void OnTumbleComplete()
 {
     DominoRacer.currentTumbeling[laneIdx] = null;
     isTumbleing = false;
     if (willKnock1 != null)
     {
         willKnock1.Tumble();
     }
     if (willKnock2 != null)
     {
         willKnock2.Tumble();
     }
 }
    void Start()
    {
        currentTumbeling = new List <DominoBlock>();

        InitLevel();

        for (int laneIdx = 0; laneIdx < lanes; laneIdx++)
        {
            currentTumbeling.Add(null);
            DominoBlock block = level[0][laneIdx];
            block.Tumble();
        }

        StartCoroutine(Game());
    }