If you're making a portable you probably need something to watch it on. (Unless you want to guess what's happening in the game, but I wouldn't advise that) Anyway, this forum is your "Hacking a pocket TV/screen" one-stop solution. Share your experiences and knowledge here.
Just buy it behind their backs. Of coarse if they walk into the room and see you try to hide it, they will probably think it's porn, but hey, atleast you'll have the book.