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A debug camera can be enabled: at offset 0x0064, replace 00 with 02.

Sonic has the idling animation from the Master System version of Sonic 1.

Aqua Lake, Gimmick Mountain, Scrambled Egg, and Crystal Egg are not present in this build.

The Zone order is noticeably different from the final: Green Hills and Sky High are the first two, followed by three Acts with no data (trying to load any of these results in a blank screen).

All other Zones are either not present at this point, or don't have any associated tiles yet.

Only Green Hills, Sky High, and Under Ground have artwork at this point.

Badniks, bosses, end-of-Act panels, Chaos Emeralds, and monitors are all entirely absent.

Similarly, the opening cutscene merely shows Sonic running.

The title screen only features Sonic, who has no animation (but rises from behind the ribbon).

The Sega screen is different, with no chant.

To select a level, at offset 0x550 replace 00 with the desired value below: To play the AutoDemo, at offset 0x705 replace AF 32 3C with C3 09 19. To disable the runtime of the AutoDemo, at offset 0x57E replace 0B 78 with 00 00. Furthermore, as the HUD resets at the start of each of the three sections, Sonic is seen using a hang glider mere seconds into play - in the final game, there are no opportunities to use one this early.

Many early screenshots of the game shown during development are thought to originate from this demo, the primary giveaway being that as gameplay is always the same, the ring and time counts at specific points never change. Much is different from the retail release of Sonic 2, most notably the introduction and title screens and the Green Hills Zone tileset.

With a special Zone/Act editor and a modified ROM, though, there are more levels than the demo shows! Following this, a static "Coming Soon" screen appears, and the demo loops from the beginning. On July 14, 2014, Orengefox from Sonic Retro obtained a copy of the AutoDemo, and the ROM was released to the public in August.Īs the name may suggest, the AutoDemo is not playable and simply plays itself (a tactic Sega would later use to great effect for Sonic Adventure): it starts with a simplified introduction sequence and title screen (much like the final game), before continuing with Sonic running through an early version of Green Hills Zone (complete with loop), gliding through a largely empty Sky High Zone, and briefly riding one of Under Ground Zone's mine carts. The Sonic the Hedgehog 2 AutoDemo is a Game Gear EPROM cartridge demonstrating the then-upcoming release of Sonic 2, sent to several magazines worldwide for preview purposes.