Casinopolis

Casinopolis is a gigantic casino that has two pinball machines a Knights pinball machine, and a sonic one that has three wheels that must be stopped 3-in a row. But, if you lose all of your balls before you get to 100 rings, you are thrown in the garbage and must fight your way out. Casinopolis also has an enormous vault that can store your rings once you get some. In Sonic Adventure DX Director's Cut, Sonic collects rings to put in the vault and uses them to get on the ledge and collect the silver Chaos Emerald. Casinopolis was also mentioned in Sonic Heroes by Amy she compared it to a casino stage that she said reminded her of Casinopolis.