Casinopolis (カジノポリス Kajinoporisu?) is a gigantic casino that appeared in Sonic Adventure as an action stage. Casinopolis is quite popular for the citizens and tourists of Station Square. It is located in the Casino Area and has many bright lights. It is usually only open at night, and can be played through by Sonic, Knuckles and Tails as their third, second and second action stage of their respective stories.