void OnTriggerEnter2D(Collider2D other)
    {
        /* Once player meets collider, determines which stone is class attached to
         * and sends information to TutorialSceneController.
         */

        MainCharacterController controller = other.GetComponent <MainCharacterController>();

        if (controller != null)
        {
            if (this.CompareTag("Patsas2"))
            {
                ctrl.activeKivi1();
            }
            else if (this.CompareTag("Patsas3"))
            {
                ctrl.activeKivi2();
            }
            else if (this.CompareTag("Patsas4"))
            {
                ctrl.activeKivi3();
            }
            else if (this.CompareTag("Patsas5"))
            {
                ctrl.activeKivi4();
            }

            normalStone.SetActive(false);
            pressedStone.SetActive(true);

            time = 0f;
        }
    }