: To unlock the Sound Test, you must beat the Time Attack special stages in under 4 minutes. Once unlocked, specific code combinations reveal hidden screens.
The PSN version retained several famous "Easter Eggs" and hidden menus: Sonic CD PSN
Sonic CD on the PlayStation Network (PSN) was a beloved 2011 remaster of the original 1993 Sega CD classic. It was primarily available for the before being delisted in 2022 to make way for the Sonic Origins collection. Game Overview : To unlock the Sound Test, you must