1. Sonic 2 Prototype Download
2. Sonic 2 Prototype Download
3. Sonic Adventure 2 Prototype Download
4. Sonic 2 Prototype Rom
5. Sonic 2 Prototype Beta

A late prototype of Sonic the Hedgehog 2 for the Sega Mega Drive.

• 1Notes

Notes

Download Sonic the Hedgehog 2 (Aug 21, 1992 prototype) (info, raw dump) A prototype of Sonic the Hedgehog 2 for the Sega Mega Drive. 1 Notes; 2 Screenshots; 3 Videos; 4 Files; 5 Header; 6 Origin; 7 See also; Notes. The Cutting Room Floor research. This prototype has a.

• This prototype was originally released by CENSOR on November 9th, 1992 just a few weeks before the final game was released.
• The original ROM was modified to include a scene intro and to bypass the copy protection. The header was also modified in an effort make the title easier to see when selecting the game from a copier. 'Sonic the Hedgehog 2 (CENSOR prototype).md' is a modification that removes the intro and restores the ROM back to the way it was meant to be.
• The original scene ROM uses the serial number from Wani Wani World.
• The ROM predates ”Beta 4” and could potentially be 'Beta 3', which wasn't included in the Sega QA Archive.
• Level select is A+START.

• Both have similarities to Crystal Egg Zone from the 8-bit version of Sonic the Hedgehog 2, so they were possibly composed by Tomonori Sawada. Act 1's music also lacks a snare unlike the PC version, so it is possible that the version in this prototype is unfinished.
• Game Information: A prototype version of Sonic 3, containing features that would never make it into the final build, has been discovered. Video game preservation communities Hidden Place and The Cutting Room Floor have been able to unearth a prototype of Sonic 3 that contains a variety of elements that were reported in a 1993 magazine preview, but never seen in the retail release.

Differences between the CENSOR beta and Beta 4

• The special stages take a long time to load. This is because some of the art assets that are compressed in Nemesis format are compressed individually in this build, whereas in Beta 4 and on most of the art was compressed in one Nemesis archive instead.
• Chemical Plant Zone's loops are slanted like in the ”Simon Wai” and ”Nick Arcade” prototypes. Because of this, the 128x128 Kosinski archive that contains the mapping for Chemical Plant is different.

• Sky Chase has a few more rings present that were deleted in Beta 4.
• The Kosinski archive for the 128x128 Wing Fortress mappings has been modified.
• A launch pad was removed from the CENSOR prototype.

• A Clucker was added in Beta 4. It was probably added as a shortcut to the top level.

• A sign post was added on the top of the ship in Beta 4.

• The second half of the loop was removed in Beta 4.

• A sign post was added in Beta 4.

• Spawning this monitor crashes the game every time. Beta 4 fixes this by changing the object's entry in the object list from 26 40 to 26 04.

• In the CENSOR prototype, it's impossible to move on to the last section of the level due to the lack of additional platforms thus making the level unbeatable. Some additional rotating platforms were added in Beta 4 before being changed to something else in later builds.

• A sign post was added in Beta 4.

• The button that opens up the floor so you can drop down from the ceiling to fight Eggman was moved slightly in Beta 4. A propeller was removed in Beta 4 as well.

• Additional rings were removed to make room for the added Clucker in Beta 4.

• Additional rings were removed from this section in Beta 4.

Sonic 2 Prototype Download

• The title card for Death Egg Zone is partially glitched in the CENSOR prototype but was fixed in Beta 4.

Screenshots

• Title screen.

• Chemical Plant Zone.

• Level select.

• Casino Night Zone.

• Mystic Cave Zone.

• Metropolis Zone

• Hill Top Zone.

• Aquatic Ruin Zone.

• Emerald Hill Zone.

• Special stage.

Videos

Files

Header

Sonic 2 Prototype Download

Fixed (Sonic the Hedgehog 2 (CENSOR prototype).md)
00000100 53 45 47 41 20 4d 45 4741 20 44 52 49 56 45 20SEGA MEGA DRIVE 00000110 28 43 29 53 45 47 41 2031 39 39 31 2e 41 50 52(C)SEGA 1991.APR00000120 53 4f 4e 49 43 20 54 4845 20 20 20 20 20 20 20SONIC THE 00000130 20 20 20 20 20 20 48 4544 47 45 48 4f 47 20 32 HEDGEHOG 200000140 20 20 20 20 20 20 20 2020 20 20 20 20 20 20 2000000150 53 4f 4e 49 43 20 54 4845 20 20 20 20 20 20 20SONIC THE 00000160 20 20 20 20 20 20 48 4544 47 45 48 4f 47 20 32 HEDGEHOG 200000170 20 20 20 20 20 20 20 2020 20 20 20 20 20 20 2000000180 47 4d 20 30 30 30 30 3130 35 31 2d 30 3026 4aGM 00001051-00&J00000190 4a 20 20 20 20 20 20 2020 20 20 20 20 20 20 20J 000001a0 00 00 00 0000 0f ff ff00 ff 00 0000 ff ff ff................000001b0 20 20 20 20 20 20 20 2020 20 20 2020 20 20 20000001c0 20 20 20 20 20 20 20 2020 20 20 20 20 20 20 20000001d0 20 20 20 20 20 20 20 2020 20 20 20 20 20 20 20000001e0 20 20 20 20 20 20 20 2020 20 20 20 20 20 20 20000001f0 4a 55 45 20 20 20 20 2020 20 20 20 20 20 20 20JUE

Sonic Adventure 2 Prototype Download

Original (Sonic2.bin)
00000100 53 45 47 41 20 4d 45 4741 20 44 52 49 56 45 20SEGA MEGA DRIVE 00000110 28 43 29 53 45 47 41 2031 39 39 32 2e 4e 4f 56(C)SEGA 1992.NOV00000120 53 4f 4e 49 43 20 32 202d 20 48 45 44 47 45 48SONIC 2 - HEDGEH00000130 4f 47 20 20 20 20 20 2020 20 20 20 20 20 20 20OG 00000140 20 20 20 20 20 20 20 2020 20 20 20 20 20 20 2000000150 53 4f 4e 49 43 20 32 202d 20 48 45 44 47 45 48SONIC 2 - HEDGEH00000160 4f 47 20 20 20 20 20 2020 20 20 20 20 20 20 20OG 00000170 20 20 20 20 20 20 20 2020 20 20 20 20 20 20 2000000180 47 4d 20 54 2d 33 33 3032 33 20 2d 30 30f5 e4GM T-33023 -00..00000190 4a 20 20 20 20 20 20 2020 20 20 20 20 20 20 20J 000001a0 00 00 00 0000 0f ff ff00 ff 00 0000 ff ff ff................000001b0 20 20 20 20 20 20 20 2020 20 20 2020 20 20 20000001c0 20 20 20 20 20 20 20 2020 20 20 20 20 20 20 20000001d0 20 20 20 20 20 20 20 2020 20 20 20 20 20 20 20000001e0 20 20 20 20 20 20 20 2020 20 20 20 20 20 20 20000001f0 4a 55 45 20 20 20 20 2020 20 20 20 20 20 20 20JUE

Sonic 2 Prototype Rom

Sonic 2 Prototype Beta