If you have seen the Usage explanation when you download, it says when you download the Xbox Live Arcade game it's availible for every user (gamertag) on the Xbox 360 you downloaded it on, now if you have a memory unit you can transfer your Xbox Live Arcade game to an other Xbox 360, but you need to activate it with
your account to play the full version on the other Xbox 360, beware you can only
move your gamer profile, it's to prevent achievement cheating
