Roll a ball

PlayerController

using UnityEngine;using UnityEngine.UI;using System.Collections;public class PlayerController : MonoBehaviour {    public float speed;    public Text countText;    public Text winText;    private Rigidbody rb;    private int count;    void Start ()
    {
        rb = GetComponent<Rigidbody>();
        count = 0;
        SetCountText ();
        winText.text = "";
    }    void FixedUpdate ()
    {        float moveHorizontal = Input.GetAxis ("Horizontal");        float moveVertical = Input.GetAxis ("Vertical");

        Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);

        rb.AddForce (movement * speed);
    }    void OnTriggerEnter(Collider other) 
    {        if (other.gameObject.CompareTag ( "Pick Up"))
        {
            other.gameObject.SetActive (false);
            count = count + 1;
            SetCountText ();
        }
    }    void SetCountText ()
    {
        countText.text = "Count: " + count.ToString ();        if (count >= 12)
        {
            winText.text = "You Win!";
        }
    }
}

Rotator

using UnityEngine;using System.Collections;public class Rotator : MonoBehaviour {    void Update () 
    {
        transform.Rotate (new Vector3 (15, 30, 45) * Time.deltaTime);
    }
}

CameraController

using UnityEngine;using System.Collections;public class CameraController : MonoBehaviour {    public GameObject player;    private Vector3 offset;    void Start ()
    {
        offset = transform.position - player.transform.position;
    }    void LateUpdate ()
    {
        transform.position = player.transform.position + offset;
    }
}