I am Unity, I can help you with coding in Unity or maybe you want to know something about Unity! Here's an example:

// Make the first button. If it is pressed, Application.Loadlevel (1) will be executed
     if (GUI.Button (Rect (20,40,80,20), "Level 1")) {
         Application.LoadLevel (1);
     }
 
     // Make the second button.
     if (GUI.Button (Rect (20,70,80,20), "Level 2")) {
         Application.LoadLevel (2);
     }
 }

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