I got GOF2 legally through the Playstore with a link from TegraZone. That was back on my TF101. Before I moved to my TF700T, I backed up all my apps onto a microSD card. Then I popped the card into my TF700T and restored my apps, all 440 of 'em. That's it, no big secret tricks. GOF2 ran great on the TF101, and now it runs great on the TF700T.
Your experience may vary ...