The Sonic the Hedgehog 2 "Simon Wai" prototype is a widely distributed prototype of Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis, which features an array of incomplete zones. It was found by Simon Wai on a Chinese website.

In the prototype copy, only four levels can be played in "normal" gameplay (though technically this is a prerelease to test some features and so there is no real level order). The rest have to be accessed through the level select code. Many are not playable, so the debug code is used to explore the acts. Genocide City Zone and Death Egg Zone are blank, causing Sonic and Tails to fall to their deaths as soon as the Act begins.

The Simon Wai prototype was widely distributed and may have been altered slightly by pirates to hide the SEGA logo from showing when the ROM boots up. The game was put on pirate cartridges with the help of a Super Magic Drive in Asia and Brazil and was then passed on as the final version. The prototype is frequently examined by hackers to determine how Sonic the Hedgehog 2 for the Mega Drive was developed.

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Cheat codes are different in the Simon Wai prototype from the final Sonic 2. These codes can be accessed by inputting button sequences or by various other methods.

- Zone Select: Enabled by default. Simply press A+Start on the title screen. You can also manually enable it by pressing Up Down Down Down Down Up then A+Start

- Debug Mode: Press C C C C Up Down Down Down Down Up then A+Start on the title screen, then highlight a zone in the stage select and press and hold: A+Start

- 2 Player vs mode: Highlight a zone in the stage select and press: B+Start for playing 2-player split-screen mode.

- Night mode: Highlight a zone in the stage select and press: C+Start.

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Krazyone13 10-19-17 - 08:31 PM
 Pretty cool. Honestly I think I like the animations for sonic better in this one and it seems like Metropolis Zone could've been an early spit-screen test.
Mynamescox44 07-04-16 - 03:03 AM
 This is an awesome concept. Props to Simon Wai for finding this.
sauce man 06-09-16 - 07:34 AM
 yeah mrhello thats one wierd glitch
baseballer05 04-16-15 - 03:29 PM
 The animations are smoother. It's not you.
Funnykirby7 03-29-15 - 01:24 PM
 Is it me, or are the animations smoother than in the final game?
homelessgoomba64 09-25-14 - 09:36 AM
 GENOCIDE CITY=NOTHING!!!
Mewfan4310 07-02-14 - 08:57 AM
 Really neat prototype. I like how you can go into the deleted zones.
mrhello 05-11-13 - 02:40 PM
 there was a music glitch in chemical plant,when the countdown appears,you will hear the stage select music,when you get out of the water,you will hear the emerald hill zone music.
mrhello 03-31-13 - 03:01 PM
 it looks like there is the master emerald in hidden palace zone,but its just a breakable object.
sibanye 06-03-12 - 08:06 PM
 wheres the enemies
sibanye 06-03-12 - 08:04 PM
 IM JUST STARTING
sonic the hedge.. 05-26-12 - 06:33 PM
 I guess it is not bad.FIRST COMMENT!