The Spiny badnik is blue instead of red in this build.

For some reason, the object ID changed from $54 to $59. It isn’t present in the object list for this stage, but the code and art still exists.

The cut badnik in Green Hill Zone has been removed.

The prototype ends after completing Aquatic Ruin.

The level order in this prototype is: Green Hill (Emerald Hill), Chemical Plant, Metropolis, Hill Top, Dust Hill (Mystic Cave), and Neo Green Hill (Aquatic Ruin).

Sonic’s final sprite has been implemented.

In comparison to that build, this prototype contains the following differences:

This build is similar in ways to the Simon Wai prototype.

The same left over data that was present in Simon Wai also exists in this build in the same area of the ROM.

The timer will still reset from 9:59 to 9:00 like in the earlier builds.

Then hold A while selecting a level from the level select.

Debug Mode - on the title screen, press C, C, Up, Down, Down, Down, Down, Up.

Two-Player Mode - on the level select, press B + Start.

Different title screen in comparison to the final.

None of the unused zone IDs contain any data aside from an associated music ID.

Hidden Palace Zone, Wood Zone, Genocide City Zone, Death Egg Zone, and the Special Stage are present in the same state as they were in the Simon Wai prototype.

The Sega logo is the same as the one from Sonic 1. However, the Sega logo will display after a level demo. Like the Simon Wai build, the game does not boot up to the Sega logo.

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