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The logo uses a very basic color palette and is missing the background and lacks copyright information. The audio quality of the Sega scream is also significantly less in comparison to the final, possibly done to save space on the cartridge. However, the screen adds horizontal lines across the screen as Sonic runs to the right for some reason. The Sega logo screen is the same one used from Sonic the Hedgehog 2.The stage palette table and the data it points to for one earlier build still exists in its entirety. This data includes the stage layout data for Lava Reef Zone Acts 1 & 2, and various 2P zones in various states of completion. The second chunk (1EAF4A-1F6FFF) contains a few leftover stage layouts and palette data from various builds of the game.Mapping (Levels\CGZ\Blocks\Primary.bin) - partial? Possible Desert Palace Zone tiles, but its all numbers Mapping (possibly 16x16 mapping for Azure Lake Zone) Mapping (128x128 mapping for Lava Reef Zone) Lava Reef Zone's Primary KosM archive header.īlank (possibly used for the background in Lava Reef Zone)Ĭollision/solid like tiles, some flower like things. Mapping (16x16 mapping for Lava Reef Zone) Mapping (128x128 for Slots, same as the one used in the prototype) Partial kosinski archive for tiles relating to slots The first leftover chunk starts at (1AACAE-1C7FFF) and contains the following Toward the end of ROM, there are two large areas containing leftover data from various earlier builds of Sonic the Hedgehog 3. There are various references to source code and assembler linking data for Star Trek: The Next Generation – Future's Past, mainly in the area where the sound driver is located. The ROM contains two kinds of leftovers.Programming for objects, stages, and more that would be completely removed from the released Sonic the Hedgehog 3 ROM are still present in this build. As such, some of the content in this prototype would be eventually cut from Sonic the Hedgehog 3 but would resurface in Sonic & Knuckles. This build of the game reflects a time during development when the developers were beginning to split the game into two.While the EPROMs have a date written on them, the header suggests the ROM might've been built sometime in October of 1993.