pause

using System;
 using UnityEngine;

 public class pause : MonoBehaviour
 {
     bool paused = false;

     void Update()
     {
         if(Input.GetButtonDown("escape"))
             paused = togglePause();
     }

     void OnGUI()
     {
         if(paused)
         {
             GUILayout.Label("Game is paused!");
             if(GUILayout.Button("Click me to unpause"))
                 paused = togglePause();
         }
     }

     bool togglePause()
     {
         if(Time.timeScale == 0f)
         {
             Time.timeScale = 1f;
             return(false);
         }
         else
         {
             Time.timeScale = 0f;
             return(true);
         }
     }
 }