Sonic CD (iPhone iPod)

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Extras

These advantages can be unlocked ether in the extras menu, time attack or playable characters.

ExtraHow to unlock
D.A. GardenClear time attack mode with a combined total of 25 minutes. Or complete the game with all time stones.
Play as tailsBeat the game once.
Sound testClear special zone time attack with a combined total of 4 minutes or under.
Special stage time attackBeat every level (including bosses) in normal time attack mode.
Stage selectClear special zone time attack with a combined total of 5 minutes or under.
Visual modeClear time attack mode with a combined total of 25 minutes or under.

I'm Outta Here

Let Sonic stand still unattended for most of three minutes and he'll say "I'm outta here!" before jumping off the screen, at which point your game ends.

Sound Test and Codes

You must beat special stage time attacks in under 4 minutes to unlock the Sound Test.

UnlockableHow to unlock
Hidden artwork 1PGM 12, DA 11.
Hidden artwork 2PGM 12, DA 2.
Hidden artwork 3PGM 03, DA 0.
Hidden artwork 4PGM 04, DA 2.
Hidden artwork 5PGM 11, DA 0.
Secret special stagePGM 07, DA 07.

Super Spin Dash

Hold down on the D-pad and press the 'Jump' button so Sonic spins on the spot. When you release the D-pad Sonic will move forward in a speed determined by how long the D-pad was held and perform his Super Spin Attack which is handy when you need to gain a lot of momentum in a tight spot.

Various Achievements

Complete the following achievements to earn their respective point scores.

AchievementHow to unlock
88 Miles Per Hour (25 points)Travel through time.
All Stages Clear! (100 points)Finish the game.
Dr. Eggman Got Served (100 points)Destroy Dr. Eggman's final machine.
Heavy Metal (100 points)Defeat Metal Sonic without getting hurt.
Just In Time! (100 points)Complete the Time Attack mode in under 25 minutes.
Just One Hug Is Enough (25 points)Get a hug from Amy.
King of the Rings (50 points)Collect 200 Rings.
Paradise Found (25 points)Complete a Zone in the Good Future.
Saviour of the Planet (100 points)Destroy all the robot transporters and Metal Sonic holograms in the past.
Statue Saviour (50 points)Find the angel statue in Wacky Workbench.
Take the High Road (50 points)Pass the upper Signpost in Collision Chaos Zone 2.
Treasure Hunter (100 points)Collect all the Time Stones.