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The World Roboticizer was a giant Roboticizer within the Death Egg Mark 2. It had the range to turn the entire planet of Mobius into a "well oiled machine". It was designed by Dr. Eggman before the first Genesis Wave.
While Dr. Eggman was preparing for the Genesis Wave he created the World Roboticizer. Once the planet was reset and the Roboticization immunity created by the Bem was gone, Eggman could turn the entire planet Mobius into a machine.
After Super Sonic set the universe back to normal, 50% of the planet regained their Roboticization immunity. Even though the universe was reset, Eggman could still Roboticize the whole planet and half of the population. Eggman also explained to Sonic the Hedgehog and Sally Acorn that if you try to roboticize something that is already mechanical, it would explode. So not only would G.U.N's bases and weapons get destroyed, Sonic and Sally's many mechanical friends would be terminated as well. Luckily though, Sonic provided a distraction while Sally destroyed the World Roboticizer, and became Mecha Sally.