Unity - How to stop the rest of the game and keeping the Gameover Menu Script active

Question

I am developing a game in Unity3D , the situation is that I do not know how to pause the game while I perform another task on Screen using Script. Let me explain this :
I am parsing XML question from my Web Interface to the Unity Game. I need to pause the game when I display a question using a script. I am unable to Pause the game while keeping the Question Displaying Script enabled simltaneously. despite putting a lot of effort from different forums suggestions.

I need to do it without TimeScale.

P.S. Its a 2-D game.