Help: Shooting a cube

Here is a short C# script that shoots blocks from the camera at the point you click on the screen. Attach this script to any game object in the scene, and click away.

 using UnityEngine;
 using System.Collections;
 
 public class FireCube : MonoBehaviour {
     
     void Update () {
         if (Input.GetMouseButtonDown (0))
         {
             GameObject  go = GameObject.CreatePrimitive(PrimitiveType.Cube);
             go.transform.position = Camera.main.transform.position;
             Rigidbody rb = go.AddComponent<Rigidbody>();
             Vector3 v3T = Input.mousePosition;
             v3T.z = 10.0f;
             go.transform.LookAt (Camera.main.ScreenToWorldPoint(v3T));
             rb.AddRelativeForce(Vector3.forward*1000);
         }
     }
 }

There are some stuff in these few lines that may be more intermediate than beginner code. Plus there are problems not solved (like the block are never destoryed). If you struggle with this code you might want start by figuring out out to attach a Rigidbody component to a cube in the editor and then move it in a script with AddForce().