Robo Defense is the ultimate portable tower defense experience. Featuring open maps, upgrades, achievements and nice graphics.
My Opinion :
WARNING : Insanely Addictive! - If you ever want to do anything With your life....don't download this game. If you ever want to get any sleep...don't download this game!
As you can see the methods are very simple. You can use any of them either according to your preference, they all work.
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thanks a lot for your help . Oh by the way if you don't know how to install APK file. than you can follow this tutorial : how to install apk files in Android phones.