CubeSpawner

cubeSpawner.cs

using UnityEngine;
using System.Collections;

public class CubeSpawner : MonoBehaviour {

	public GameObject cube;

	void Start() {
		StartCoroutine(spawnCubes());
	}

	IEnumerator spawnCubes() {
		while(true) {
			yield return new WaitForSeconds(3.0f);
			Instantiate (cube);
		}
	}

	void Update() {
		if (attack())
			StartCoroutine (attackEnemies())
	}

	IEnumerator attackEnemies() {
		Physics.OverlapSphere(transform.position, 25.0f);
	}
}