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, and the ROM was released to the public that 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 game, sent to several magazines worldwide for preview purposes.

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