This page contains Sonic CD Unlockables for iPhone - iPod called "Sound Test" and has been posted or updated on May 6, 2013 by mattyman222. Let us know what you think of this Unlockable by thumbs voting. Note: This apple iPhone game app may also be compatible with the game app for apple iPad.
- Developer: Sega
- Publisher: Sega
- Genre: Action Platformer 2D
- Release Date: Dec 15, 2011
- ESRB: Everyone
Beat special stage time attacks in less then 4 minutes to unlock the Sound Test.
- Hidden artwork 1: PGM 12, DA 11
- Hidden artwork 2: PGM 12, DA 2
- Hidden artwork 3: PGM 03, DA 0
- Hidden artwork 4: PGM 04, DA 2
- Hidden artwork 5: PGM 11, DA 0
- Secret special stage: PGM 07, DA 07
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