Answer by Ben Humphreys

I [re-read the manual][1] and found out how to do it using StopByName and StartCoroutine. This works: int comboScore = 0; IEnumerator ChangeNumber(int num) { UILabel label = number.GetComponent(); label.text = ""+num; iTween.StopByName("ComboAnim"); // Have to manually reset scale otherwise combo gets bigger number.transform.localScale = new Vector3(baseSize, baseSize, 1); yield return new WaitForSeconds(0.01f); iTween.PunchScale(number, iTween.Hash( "name","ComboAnim", "amount",new Vector3(scaleUp, scaleUp, 1), "time",1/speed ) ); } void Update() { if (Input.GetKeyDown("up")) { // Debugging purposes comboScore++; StartCoroutine(ChangeNumber(comboScore)); } } [1]: http://itween.pixelplacement.com/documentation.php#StopByName