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The clamshell handheld that split gaming in two — literally. Nintendo's dual-screen DS added a touch-sensitive bottom screen and stylus, backward compatibility with Game Boy Advance cartridges, and era-defining hits like Nintendogs, Brain Age, and Mario Kart DS that proved touch controls weren't a gimmick.
Thumb-sized figurines inside impossibly small clamshell compacts — you'd flip one open and find an entire world compressed into plastic the size of a mint tin. Invented by Chris Wiggs and made by UK's Bluebird Toys, these collapsible worlds were so addictive that parents had to confiscate them during family road trips.