Need help on triggers, using uther map as example

I am working on a new type of hero arena type map

and can anyone help me out or recognize the triggers or whatever the persons did to...

1) In uther party, when a mini game is brought up the entier mini map turns into some type of background file while the mini map really only shows the surroundings of the mini game enclosement area, how is this accomplised

simply in the map when a mini game starts you cant move your screen beyond the mini games area, and the mini map also is focused entirely on that one mini game area while you can see the entire map mini map in the background of the mini map window

2) how do you go about setting stuff up to randomly choose something or randomly do something? as in my main question how do you go about randomly choosing a mini game? did he set up a random pick trigger which once a game is picked it actually opens up all the triggers of that mini game and closes the others?

hope anyone can help I may have more questions later

This is what you do under the camera actions there is Set Camera Bounds. That restricts the camera to where ever you set it. K