Sonic the Hedgehog 2 (8-bit) AutoDemo - Walkthrough

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The Sonic the Hedgehog 2 AutoDemo is a Sega Game Gear EPROM cartridge demonstrating the then-upcoming release of Sonic the Hedgehog 2. It was sent to several magazines worldwide for preview purposes. On July 14, 2014, Orengefox obtained a copy of the AutoDemo, and the ROM was released to the public in August.

As the name may suggest, this Sonic 2 AutoDemo is not playable - instead, the demo plays itself, starting 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. Following this, a static "Coming Soon" screen appears, and the demo loops from the beginning.

A single music track plays throughout the demo - one not present in the final game. Much is different from the retail release of Sonic 2, most notably the introduction and title screens and the Green Hills Zone tileset. Tails is also completely missing.

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. 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.

The AutoDemo has an internal date code of 1991-12-05, nine months before the final's date of 1992-09-05.

#SonicPrototype #SonicBeta

[bluersonic]

Can we just talk about how *_SMOOTH_* the loop animation is on Sonic? That’s a LOT of frames for the game gear.

[itsNikash.]

3:01 time to run on the invisible loop

[decemberhead]

seeing a loop in 8-bit Sonic is a very welcome surprise :))

[MSOGameShow]

Everyone's talking about the invisible loop at 3:00 but no one is giving any love to the one at 5:30.

[kholdkhaosray]

I actually like the music for this level. It's pretty catchy. The intro to it's nice

[ImExistent]

This prototype has the Green Hill Zone tunnels

[owendinostudios]

Thank you so much I would’ve been lost without this

[x-mighty]

This should've been the first level.

[andresbravo]

Can’t sit here all day seeing the Autodemo for good.

[yattibanks]

Feels like I'm watching one of those fake creepy pasta hacks that claim to be prototypes.

[juegagm]

El apartado artistico se me hace hermoso la primera zona parece ser una fase muy primitiva de green hills que me fascina como luce igual con la primera zona del juego final que parece ser que iba a hacer la 3 originalmente posiblemente por la baja potencia de la gg y de la sms no se pudo poner lo que se tenia planeado pero es curioso ver como la idea inicial sale algo muy diferente por cierto hermoso el detalle del nivel de mina

[conlia]

I actually kinda prefer this look for Green Hills compared to the final version.


not sure about the weird ass palm trees tho

[mistashadow]

Is this the easiest Sonic game ever?

-oh, didn't realise manual control is given in this version-

[imhexv]

4:50
Sonic: *falls in lava*
Game: *crash*

[bakedbeansman]

THE LEVEL IS THE ENDING CUTSCENE! I GUESS THAT MEANS IT'S OUT-OF-TIME-HILL!!!! (Play the João Araya port to get the joke)

[etrotmthebluewolf]

Would you guys ever check out Sonic MADventure

[juanmanuelgarciapadilla]

Excelente demo razon y zenon ha mi seme hiso dificil siguan asi son lo mejor los number 👍😎😉

[nathanielhermanson]

4:50 I played the demo of the game and frozen.

[bricklander]

how do you access the other zones? every time i go to the end of "act 1" my game resets

[johtotrainermax]

So... How do you PLAY it? Any specific binary needed to be changed? At all?