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E-66 Da-Dai-Oh is a gigantic robot that Doctor Eggman brought with him during his vacation.
It looks like a large metallic dome with legs, arms, and a head where Eggman is seated. It had extendable arms and spiked balls for hands, but was destroyed when it slipped on some unsteady ground. It was 100 meters (300 feet) tall and weighed 1000 tons.