Pop up a screen on the game?

Hi,

When my player dies, I want to stop the game and open up a full screen menu that has some buttons on it, like ones when you die in runner games that you can purchase lives or stuff. But I don’t know how to do this.

I know how to make a button and I think I have to make a container and somehow make a full screen image dynamically to the size of the game so player cannot press game’s button while this menu is open, I just need to know basic ideas on how to do this, I’ll figure out the details myself.

Thanks.