Doraemon: Nobita no Shin Makai Daibouken DS Cheats - Nintendo DS
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Badges
On your save slots, there are three squares. By performing the stated in-game tasks, you'll be able to unlock them:
Clear Badge (first badge) - Complete the main storyline.
Card Badge (second badge) - Get a certain amount of cards (depending on the amount, the color of the badge changes).