Yu-Gi-Oh! GX Tag Force 2
It is a system used to unlock rare cards through other games in the Tag Force series. New cards can be got depending on the game title used in UMD recognition. In addition, at recognizing the past Tag Force games, will be unlock three special cards called "Slifer the Sky Dragon", "Obelisk the Tormentor", and "The Winged Dragon of Ra". Also will be available hidden packs for purchase.