RollABall_jump_reset.cs

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class PlayerController : MonoBehaviour {

	public float speed;
	public int numCubes;
	public Text countText;
	public Text winText;
	public Text oopsText;

	private Rigidbody rb;
	private int count;
	private ArrayList collected = new ArrayList();
	private bool jumped;

	void Start() 
	{
		rb = GetComponent<Rigidbody>();
		count = 0;
		SetCountText();
		winText.text = "";
		oopsText.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);

		if (this.transform.position.y <= -20)
		{
			this.transform.position = new Vector3 (0, 5, 0);
			count = 0;
			foreach (Collider thing in collected) {
				thing.gameObject.SetActive(true);
			}
			collected = new ArrayList();
			SetCountText ();
			oopsText.text = "Oops! Try Again!";
			winText.text = "";
		}
		if(Input.GetKeyDown("space") && !jumped)
		{
			Vector3 bounce = new Vector3 (0.0f, speed * 20, 0.0f);
			rb.AddForce(bounce);
			jumped = true;
		}
	}

	void OnTriggerEnter(Collider other) 
	{
		if (other.gameObject.CompareTag("Pick Up"))
		{
			other.gameObject.SetActive(false);
			count++;
			SetCountText();
			collected.Add (other); //
		}
		oopsText.text = "";
	}

	void SetCountText ()
	{
		countText.text = "Count: " + count.ToString ();
		if (count >= numCubes) 
		{
			winText.text = "You have won!";
		}
	}

	void OnCollisionStay()
	{
		jumped = false;
	}
}