Which Is The Actual Game?(Max or no Max Screen)

It won't scale anything bigger than resolution you have set, but when it uses lower resolution there should be text "Using resolution x" on top left corner of the Game screen.

Basically GameObjects will scale on resolution changes, but GUI won't if not set. This will be problem if you try to run your game on different resolutions (on bigger resolutions GUI will be small and on small resolutions GUI will be big).

Here is a good script for scaling GUI from SilverTabby in JavaScript:

 var native_width : float = 1920;
 var native_height : float = 1080;
  
 function OnGUI ()
 {
     //set up scaling
     var rx : float = Screen.width / native_width;
     var ry : float = Screen.height / native_height;
     GUI.matrix = Matrix4x4.TRS (Vector3(0, 0, 0), Quaternion.identity, Vector3 (rx, ry, 1)); 
  
     //now create your GUI normally, as if you were in your native resolution
     //The GUI.matrix will scale everything automatically.
  
     //example
     GUI.Box(  Rect(810, 490, 300, 100)  , "Hello World!");
  
 }

http://answers.unity3d.com/questions/169056/bulletproof-way-to-do-resolution-independant-gui-s.html

And my translation to C#: float native_width = 720; float native_height = 1280;

 void OnGUI()
 {
     float rx = Screen.width / native_width;
     float ry = Screen.height / native_height;
     GUI.matrix = Matrix4x4.TRS (new Vector3(0f, 0f, 0f), Quaternion.identity, new Vector3(rx, ry, 1f));
     GUI.Box(new Rect(810, 490, 300, 100), "Hello World!");
 }