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The Bluebird of Zappiness is a device invented by Hacker that is used to help restore Motherboard's memory when he infected her with the virus. Motherboard hid it in a location that she did not even know herself.
Until The Bluebird of Zappiness, only Hacker and two of Motherboard's friends each had one clue to where the Bluebird was. The episode showed that it was located at the Hoodoo on top of Sensible Flats. After some fighting amongst Ledge, the Cybersquad, and Hacker, the Bluebird was lost.