Before Robotnik's takeover, Mobotropolis was a beautiful city with civilization and nature coexisting in perfect harmony. Now a vast city of only both technology and pollution, Robotropolis is a dreary and lifeless metropolis. At the heart of this city of evil lies Robotnik's headquarters, which used to be the [[Royal Hedgehog Palace]] (one of ''several'' palaces owned by the royals). One particularly characteristic building in the city was reminiscent of a multi-storied pyramid. In addition, the city also held a laboratory for [[Uncle Chuck (AngieYaz Sonic Underground reboot)|Sir Charles Hedgehog]], the queen's brother.