Improvements to Unity Endless Runner tutorial from http://catlikecoding.com/unity/tutorials/runner/; Find more information about my version at http://ideascomecheap.blogspot.com/search/label/Unity%20Endless%20Runner%20Tutorial

GameExitManager.cs

// This is a new file that is not mentioned in the tutorial
//
// To use this, create a new empty under manager with this attached
//
// This is created so that Android application can be exited by pressing the back button

using UnityEngine;

public class GameExitManager : MonoBehaviour {

	void Update () {
		if (Input.GetKeyDown("escape")) {
			Application.Quit();
		}
	}
}

GUIManager.cs

using UnityEngine;

public class GUIManager : MonoBehaviour {

	public GUIText boostsText, distanceText, gameOverText, instructionsText, runnerText;

	private static GUIManager instance;

	void Start() {
		instance = this;
		GameEventManager.GameStart += GameStart;
		GameEventManager.GameOver += GameOver;
		gameOverText.enabled = false;
		// Hans
		boostsText.enabled = false;
		distanceText.enabled = false;

		if (Application.platform == RuntimePlatform.Android) {
			instructionsText.text = "Tap to play";
		}
	}

	void Update() {
		if ((Input.GetButtonDown("Jump")) ||
		    ((Application.platform == RuntimePlatform.Android) && (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began))) {
			GameEventManager.TriggerGameStart();
		}
	}

	private void GameStart() {
		gameOverText.enabled = false;
		instructionsText.enabled = false;
		runnerText.enabled = false;
		// Hans
		boostsText.enabled = true;
		distanceText.enabled = true;
		enabled = false;
	}

	private void GameOver() {
		gameOverText.enabled = true;
		instructionsText.enabled = true;
		enabled = true;
	}

	public static void SetBoosts(int boosts) {
		instance.boostsText.text = boosts.ToString();
	}

	public static void SetDistance(float distance) {
		instance.distanceText.text = distance.ToString("f0");
	}
}

Runner.cs

using UnityEngine;

public class Runner : MonoBehaviour {

	public static float distanceTraveled;
	public float acceleration;
	public Vector3 boostVelocity, jumpVelocity;
	public float gameOverY;

	private bool touchingPlatform;
	private Vector3 startPosition;
	private static int boosts;

	void Start() {
		GameEventManager.GameStart += GameStart;
		GameEventManager.GameOver += GameOver;
		startPosition = transform.localPosition;
		renderer.enabled = false;
		rigidbody.isKinematic = true;
		enabled = false;
	}

	private void GameStart () {
		boosts = 0;
		GUIManager.SetBoosts(boosts);
		distanceTraveled = 0f;
		GUIManager.SetDistance(distanceTraveled);
		transform.localPosition = startPosition;
		renderer.enabled = true;
		rigidbody.isKinematic = false;
		enabled = true;
	}

	private void GameOver() {
		renderer.enabled = false;
		rigidbody.isKinematic = true;
		enabled = false;
	}

	void Update () {
		if ((Input.GetButtonDown("Jump")) ||
		    ((Application.platform == RuntimePlatform.Android) && (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began))) {
			Jump ();
		}
		distanceTraveled = transform.localPosition.x;
		GUIManager.SetDistance (distanceTraveled);

		if (transform.localPosition.y < gameOverY) {
			GameEventManager.TriggerGameOver();
		}
	}

	void FixedUpdate() {
		if (touchingPlatform) {
			rigidbody.AddForce(acceleration, 0f, 0f, ForceMode.Acceleration);
		}
	}

	void OnCollisionEnter() {
		touchingPlatform = true;
	}

	void OnCollisionExit() {
		touchingPlatform = false;
	}

	public static void AddBoost() {
		boosts += 1;
		GUIManager.SetBoosts(boosts);
	}

	private void Jump() {
		if (touchingPlatform) {
			rigidbody.AddForce(jumpVelocity, ForceMode.VelocityChange);
			touchingPlatform = false; // This allow one jump after colliding with side of platform, but not more
		}
		else if (boosts > 0) {
			rigidbody.AddForce(boostVelocity, ForceMode.VelocityChange);
			boosts -= 1;
			GUIManager.SetBoosts (boosts);
		}
	}
}

Amazing project....!! Good

I need this idea...