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

Back to: Sonic the Hedgehog 2 (8-bit) AutoDemo.

Free movement

Changing byte 64 to 2 will enable the ability to move around a level freely. Once enabled, hold and press the D-Pad in any direction during gameplay to move Sonic around.

Unused content

Art

Art	Description
	Sprites that depict Sonic laughing in a rather creepy manner. Purpose unknown.
	A frame of Sonic's idle animation from the Master System version of Sonic 1, but altered to make him look happy.
	An early skidding animation, which looks closer to those from the Mega Drive version.
	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.
	No monitors appear in any level, but graphics for them are loaded at the Sega/title screen.
	These button sprites are located within the Under Ground Zone tileset, but aren't used in any Acts.
	Under Ground Zone only has downward-facing spikes at this point, rendering these upward spikes unused.
	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.
	Blocks can't be destroyed in the AutoDemo, leaving this fragment unused.
	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.
	The 16x16 font from the unused level title cards (see below). Only 8 of the 41 characters get used.

Early title card

Setting ROM address 2BA to 3 will sometimes load an early title card on resets. It crashes to a black screen after two seconds.

Build date

Similar to other games developed by Aspect, the game's build date can be located at ROM address C0:

MS SONIC¥THE¥HEDGEHOG.2 Ver0.00 1991/12/05 Aspect Co.,Ltd