Cart pass

The cart pass is a card that appears in Sonic Adventure and Sonic Adventure DX: Director’s Cut.

Description
The cart pass is a black card that has "Twinkle Circuit PASS" written on the front, with the back being white with unreadable text.

Overview
The cart pass is used by Knuckles, Gamma , and Tails in order to access the Twinkle Circuit mini game, due to the fact that, unlike Sonic , Amy , and Big , the former three cannot access Twinkle Circuit normally. As such, the cart pass is necessary to use if one wishes to play Twinkle Circuit with the former three characters, which is necassary in order to collect all Emblems.

Reference list
A cart pass! Now I can get into Twinkle Circuit! Knuckes mission mode sonic adventure