gistfile1.txt

using UnityEngine;
using System.Collections;

public class Door : MonoBehaviour {

	public GameObject prefab;

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {

	}

	void OnCollisionEnter2D(Collision2D col){
		if (prefab == null && col.gameObject.tag == "door") {
						Destroy(col.gameObject);
		}
	}
}