The Card e-Reader is a peripheral device for the Game Boy Advance. Its main function was to read data from special cards, unlocking content in compatible games. It wasn't a game in itself, but rather an accessory that expanded the capabilities of other Game Boy Advance software.  The device was officially developed by Nintendo, allowing for additional gameplay and content via these specialized cards.

Card e-Reader (J)(Independent)

Car Battler Joe (U)(Venom)