How to create pop up menus that overlay game

Hi,

I’ve played this application called Slap Happy from Happy Tree Friends and was wondering how they did their menu system.

The one on the top-left brings up normals menus and the one on the top-right brings up a sliding menu.

I have a rough idea how it can be done but need a second opinion if there’s a proper way to do it.

The idea I have is to create a long plane and only show bits of it on the screen. Once I click on it, it will slide(animated through code or done inside Unity?) on the screen.

I tried to see if there’s any post about creating animating menus that overlay the game but can’t find any that suits my idea.

Appreciate the help.

Thanks in advance.
-Hakimo

Anyone?

Just in case I’ve confused everyone, I would like to implement an animated GUI and wonder what is the correct approach to do so.

Thanks in advance.
-Hakimo