public static void OnScore(int amount)
    {
        CashManager.AddCash(amount);

        int preMultiplier = CashManager.Multiplier;

        XPManager.AddXP(amount * preMultiplier);

        CashManager.AddMultiplier();
        if (CashManager.Multiplier != preMultiplier)
        {
            if (OnMultiplierChange != null)
            {
                OnMultiplierChange(CashManager.Multiplier);
            }
        }
    }