Twinkle Circuit

Twinkle Circuit is a sub game in Sonic Adventure. It's located near the entrance to Twinkle Park. Sonic, Amy, and Big have access to it after they beat Twinkle Park. Tails, Knuckles, and Gamma can access it after finding a pass in the grass obtainable after beating their respective stories. By completing Twinkle Circuit with a character the player receives an emblem.