When you're in the middle of a match hit the menu button on your phone. When the options pop up hit the button under the reset match button. After that hit the back button your phone 3 times and a window should pop up asking you if you want to exit.

 

Just press home... Angry Birds doesn't stay open.

 

Yes it does, If you leave by pressing home then come back a short time later it will be right where you left off. The beta version would close everytime, but the current version will stay open until the OS automatically closes it when it needs the resources.

 

During a game, press the menu button, hit the icon that has a 3 bulletpoints with lines, then back several times until it asks you "Do you really want to exit?".. and from there, hit the check mark.

 

Well, I guess somethings different with mine. Cause whenever I exit my angry birds it closes completely. I've checked what's running too, and it's not there either.

That's the case with most (not all though) of my apps.

 

do you run a task killer?