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This is a sub-page of Proto:Sonic the Hedgehog 2 (Genesis)/Nick Arcade Prototype.

Final Zone#

• Hill Top's graphics are used. Sonic 1's Final Zone uses Scrap Brain's graphics, so this is unsurprising.
• Going left drops you over an edge to a dead end.
• If the camera moves past X coordinate $2147, the game crashes with a purple screen. This is because the game tries to load the art for the final boss by loading art cue $1F which does exist, but references data that is not a pattern load cue, causing the game to read garbage art data as a pointer and lock up.
• Through hacking to disable the art load request (such as with PAR code 007B66:7000), it is possible to go further into the Zone. The Sonic 1 final boss' object number will load, but the boss' code is gone and replaced with a dummy object. Because of this, there's nothing to fight and hence no way to reach the ending (or what's left of it in this build; see next section).
• The level layout is actually that of Hill Top Act 1, with no rings or objects (which is odd considering Sonic 1 used the layout of Scrap Brain Act 2). Playing past the point where Act 1 would normally end will simply lead you to a pit. Going past the pit with Debug Mode will lead to a large void before the beginning of the level layout loops over.
• Beating the level by hacking a signpost into it sends you to the Sega screen. This is consistent with Sonic 1, as the ending could only be triggered by beating the boss. Even if the boss was implemented, the game would then crash due to the ending "screen" not existing anymore.

Ending Scene (Zone ID 06)#

Watch on YouTubeBy using Action Replay code FFFE10:0600 you can access Zone ID 06, which was the ending scene in Sonic 1. The stage uses Final Zone's music, Green Hill's art and palette, and Chemical Plant's layout.

Unfortunately, it's also very much broken: The stage is mostly garbage data still left over in the ROM, some collision is present, and some pattern load cues must be modified or else the game will crash with a blue screen when starting the level. Green Hill's chunk compression and level header also must be used here to prevent a crash. Trying to access Acts 2 or 3 of this Zone will result in an Illegal Instruction error.

Special Stage#

Watch on YouTubeThe game crashes while loading it due to bad pointers and missing art, but most of the code is based on the Sonic 1 Special Stage.

It is possible to modify the code to where it won't crash, and doing so reveals that the graphics have been deleted from the ROM. The color palettes still work, though, and the coding for all objects is still present.