The Nintendo e-Reader, commonly abbreviated as e-Reader, is an add-on manufactured by Nintendo for its Game Boy Advance handheld video game console. It has an LED scanner that reads "e-Reader cards" — paper cards with specially encoded data printed on them as dot codes. It was released in Japan in December 2001 and in North America in September 2002. Depending on the card and associated game, the e-cards are typically used in a key-like function to unlock secret items, levels, or play mini-games when swiped through the reader. The cards themselves contain data, as opposed to unlocking data already on the device itself.

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