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Sonic the Hedgehog 2 (8-bit) AutoDemo/Hidden content

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Free movement

Sonic2AutoDemo GG FreeMovement.png

Changing byte 0x0064 to 02 will enable the ability to move around a level freely. Once enabled, hold 1 and press the D-Pad in any direction during gameplay to move Sonic around.[1]

Unused content

Art

Art Description
Sonic2AutoDemo GG Sprite LaughingSonic.png
Sprites that depict Sonic laughing in a rather creepy manner. Purpose unknown.
Sonic2AutoDemo GG Sprite HappyWaitingSonic.png
A frame of Sonic's idle animation from the Master System version of Sonic 1, but altered to make him look happy.
Sonic2AutoDemo GG Sprite SkiddingSonic.png
An early skidding animation, which looks closer to those from the Mega Drive version.
Sonic2SMSEarlyDeathSprite.png
Sonic can't die in this prototype, so this death sprite goes unused. It is identical to the final's early death sprite, taken from the Master System version of Sonic 1.
Sonic2AutoDemo GG Sprite Monitors.png
No monitors appear in any level, but graphics for them are loaded at the Sega/title screen.
Sonic2AutoDemo GG Sprite Switch.png
These button sprites are located within the Under Ground Zone tileset, but aren't used in any Acts.
Sonic2AutoDemo GG Sprite UGZSpikes.png
Under Ground Zone only has downward-facing spikes at this point, rendering these upward spikes unused.
Sonic2AutoDemo GG Sprite Explosion.png
There's nothing that can explode in the AutoDemo, so the explosion tiles that are located within the number/icon sprites are never seen in action.
Sonic2AutoDemo GG Sprite Fragment.png
Blocks can't be destroyed in the AutoDemo, leaving this fragment unused.
Sonic2AutoDemo GG Sprite SHZTrees.png
The trees seen in the final Sky High Zone and in some prerelease screenshots are present in the ROM, but not actually used at this point.[2]
Sonic2AutoDemo GG Sprite TitleCardFont.png
The 16x16 font from the unused level title cards (see below). Only 8 of the 41 characters get used.

Early title card

Sonic2AutoDemo GG TitleCard.png

Setting ROM address 0x2BA to 03 will sometimes load an early title card on resets. It crashes to a black screen after two seconds.[3]

References


Sonic the Hedgehog 2 (8-bit) AutoDemo, prerelease version of Sonic the Hedgehog 2 (8-bit)
Sonic2AutoDemo GG title.png

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Part of Sonic the Hedgehog 2 (8-bit) development