A variant type of Power-Up Cards are Switch Cards, which will trigger something in the game upon being scanned. There is no limit as to how many times an item card can be used. Power-Up Cards upload an item (or a set of items) into either Mario or Luigi's inventory.These are the types of cards that were released:
This feature is normally absent in the European version of the game, but it can be enabled using a cheat device. Upon scanning in one of three types of cards, something will then be triggered in the game. 3 features e-Reader compatibility, in that it can link up to a second Game Boy Advance with an e-Reader.
Artwork on the back of each type of card: Power-Up Cards, Demo Cards, and Level Cards
