Debug Mode...
	Sound Test Codes...
	Sound Test Screen...
	Tails...
	Various Achievements...

At the sound test screen (must be unlocked): Enter the following tracks: PCM 12 DA 11. After seeing a picture of Tails, start a new game, holding down A + Start. It is okay to skip the intro. Just ensure you are holding down A + Start by the time the zone loads up. You will know if it worked if you see your X and Y coordinates ticking on the upper right hand of the screen. B button: Debug mode. A button: Cycles object (while in debug) X button: Places object (while in debug) Achievements will be disabled and Zone/Act times will not be recorded while Debug Mode is active.

Entering the following numbers in the Sound Test to access these messages (You will need Sound test Unlocked in Extras): (Codes work with both Japanese and American sound tracks)

Effect	Code
"Batman" Sonic	PCM 04 DA 21
Cute Sonic	PCM 11 DA 09
Dj Mc Sonic	PCM 03 DA 01
Secret Special Stage	PCM 7 DA 7
Tails - See you Next Game	PCM 12 DA 11
That Freaky Sonic One	PCM 12 DA 25

At the intro, enter: Down, Down Down, Left, Right, A.

Beat the game as Sonic.

Achievement	How to unlock
88 Miles per Hour (5)	Travel through time.
All Stages Clear! (15)	Finish the game.
Dr. Eggman Got Served (30)	Destroy Dr. Eggman's final machine.
Heavy Metal (15)	Defeat Metal Sonic without getting hurt.
Just in Time! (35)	Complete the Time Attack mode in under 25 minutes.
Just one hug is enough (5)	Get a hug from Amy.
King of the Rings (10)	Collect 200 Rings.
Paradise Found (5)	Complete a zone in the Good Future.
Saviour of the Planet (40)	Destroy all the robot teleporters and Metal Sonic holograms in the past.
Statue Saviour (10)	Find the angel statue in Wacky Workbench.
Take the High Road (10)	Pass the upper Signpost in Collision Chaos Zone 2.
Treasure Hunter (20)	Collect all the Time Stones.