// Delays quitting for 2 seconds and
    // loads the finalsplash level during that time.
    var showSplashTimeout : float = 2.0;
    private var allowQuitting : boolean = false;
    function Awake () {
        // This game object needs to survive multiple levels
        DontDestroyOnLoad (this);
    }
    function OnApplicationQuit () {
        // If we haven't already load up the final splash screen level
        if (Application.loadedLevelName.ToLower() != "finalsplash")
            StartCoroutine("DelayedQuit");
        // Don't allow the user to exit until we got permission in
        if (!allowQuitting)
            Application.CancelQuit();
    }
    function DelayedQuit () {
        Application.LoadLevel("finalsplash");
        // Wait for showSplashTimeout
        yield WaitForSeconds(showSplashTimeout);
        // then quit for real
        allowQuitting = true;
        Application.Quit();
    }

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public float showSplashTimeout = 2.0F;
    private bool allowQuitting = false;
    void Awake() {
        DontDestroyOnLoad();
    }
    void OnApplicationQuit() {
        if (Application.loadedLevelName.ToLower() != "finalsplash")
            StartCoroutine("DelayedQuit");
        
        if (!allowQuitting)
            Application.CancelQuit();
        
    }
    IEnumerator DelayedQuit() {
        Application.LoadLevel("finalsplash");
        yield return new WaitForSeconds(showSplashTimeout);
        allowQuitting = true;
        Application.Quit();
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public showSplashTimeout as single = 2.0F

    private allowQuitting as bool = false

    def Awake():
        DontDestroyOnLoad(self)

    def OnApplicationQuit():
        if Application.loadedLevelName.ToLower() != 'finalsplash':
            StartCoroutine('DelayedQuit')
        if not allowQuitting:
            Application.CancelQuit()

    def DelayedQuit() as IEnumerator:
        Application.LoadLevel('finalsplash')
        yield WaitForSeconds(showSplashTimeout)
        allowQuitting = true
        Application.Quit()