Sonic the Hedgehog CD/Hidden content

Lost Sprites

Artwork	Name	Description
	"Eyes closed" Animation	Perhaps an animation played when idling the game for a while.
	"Electrified" Animation	Sonic being electrocuted.
	"Falling" Animation	Sonic falling into something.
	"Walking" Animation	Strange walking animation. Who knows when this could have been used. Perhaps when running through shallow water.
	"Looking Back" Animation	Sonic looking over his shoulder.
	"Sneeze" Animation	Probably another idle animation.
	"Falling" Animation	Possibly used when running out of air while underwater.
	"Backward" Animation	Probably an extra being hit animation.
File:Scdsomething.png	"What" Animation	Who knows what this could of been used for.
	"Another" Animation	Possibly used for Sonic going super.
	"Turn" Animation	Probably an extra turning around animation.
	"Hanging" Animation	Sonic is being pulled up by something.
File:Scdslick.gif	Oil Slick	Oil slick used in special stages that cause you to slip. These can be found normally in the some prototype versions.

Extra Special Stage

A special level can be acceessed from the Sound Test menu by setting all the 3 selections to 07. According to a former Sega Europe QA Tester an extra Time Stones was to be located here and when collected in addition to the previous Time Emeralds S TV monitors would appear where the ring TV's were located. When broken you would morph into Super Sonic, which would grant only invincibility and greater speed.

Unused Music Loops

Within the ISO for one of the Sonic CD prototypes were some specific files, preceded with the letters "SNCBNK", with a number afterwards. The numbers referred to the timezone for which the file represented.

Each file is a small music loop, played using the PCM chip on the Sega CD, in accordance to the timezone it represents. Speculation has been rampant as to their use, but two theories have stemmed that seem to be relatively plausible:

• They were intended to be used to bridge the gap between when a CD audio track plays and when it starts again. (Shadow Hog)
• They were intended to be played at the start of a level, before the CD audio played. (StephenUK)

Of course, there's no concrete evidence to support either idea, but it's an interesting debate nonetheless.

Get the files here, courtesy of ICEknight. Get Shadow Hog's edited files merged with the CD audio tracks here. Check out discussion of this oddity in

this forum topic.

Prototype Music Tracks

In the 510 beta of Sonic CD, there were two distinctly different music tracks not featured in the final version of the game. scd510_28.mp3 is an alternate speed shoes track, while scd510_25 is an alternate title screen track.

Get them here.