Scripts

DestroyByContact Script

using UnityEngine;
using System.Collections;

public class DestroyByContact : MonoBehaviour 
{
    public GameObject explosion;
    public GameObject playerExplosion;

    void OnTriggerEnter(Collider other)
    {
        if (other.tag == "Boundary")
        
        {
            return;
        }
        Instantiate (explosion, transform.position, transform.rotation);
        if (other.tag == "Player") {
            Instantiate (playerExplosion, other.transform.position, other.transform.rotation);
        }
        Destroy (other.gameObject);
        Destroy (gameObject);
    }
}
DestroyByBoundary

using UnityEngine;
using System.Collections;

public class DestroyByBoundary : MonoBehaviour 
{
    void OnTriggerExit (Collider other) 
    {
        Destroy(other.gameObject);
    }
}