How to do it...

To move objects by clicking on them, follow these steps:

1. Delete the Cube-player GameObject.
2. Set the position of Main Camera to (0, 3, -5) and its rotation to (25, 0, 0).
3. Create a C# script class called ClickMove:

using UnityEngine;
[RequireComponent(typeof(Rigidbody))]
public class ClickMove : MonoBehaviour {

 public float multiplier = 500f;
 private Rigidbody rigidBody;

 private void Awake() {
   rigidBody = GetComponent<Rigidbody>();
 }

 void OnMouseDown() {
   float x = RandomDirectionComponent();
   float y = RandomDirectionComponent();
   float z = RandomDirectionComponent();
   Vector3 randomDirection = new Vector3(x,y,z);
   rigidBody.AddForce(randomDirection);
 }

 private float RandomDirectionComponent() {
   return (Random.value - 0.5f) * multiplier;
 }
} 

4. Create a Cube GameObject and add an instance object of the ClickMove script class as a component.