Sonic the Hedgehog 2 (CENSOR prototype)

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Title Screen
Sonic the Hedgehog 2 (CENSOR prototype)
Dump status Released
Dumped by CENSOR
Released by CENSOR
File release date November 9, 1992
Origin EPROM Cartridge
Lot Old Scene (BBS)
Files SONIC2.LZH
Game Sonic the Hedgehog 2
System Sega Mega Drive
Genre Action Platformer
Final build Sep 29, 1992 10:33:00
Release date JP Nov 21, 1992
US Nov 24, 1992
EU Nov 24, 1992
Download Sonic the Hedgehog 2 (CENSOR prototype) (info)

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

Notes

  • 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 ROM predates ”Beta 4” and is possibly "Beta 3", which wasn't included in the Sega QA Archive.
  • Level select is A+START.

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.
Sonic the Hedgehog 2 (CENSOR prototype).2019-02-13 08.36.18.png
  • Wing Fortress Zone differences
  • The Kosinski archive for the 128x128 Wing Fortress mappings has been modified.
  • A launch pad was removed from the CENSOR prototype.
S2censorcompare1-1.png S2censorcompare1-2.png
CENSOR Beta 4
  • A Clucker was added in Beta 4. It was probably added as a shortcut to the top level.
S2censorcompare2-1.png S2censorcompare2-2.png
CENSOR Beta 4
  • A sign post was added on the top of the ship in Beta 4.
S2censorcompare3-1.png S2censorcompare3-2.png
CENSOR Beta 4
  • The second half of the loop was removed in Beta 4.
S2censorcompare4-1.png S2censorcompare4-2.png
CENSOR Beta 4
  • A sign post was added in Beta 4.
S2censorcompare5-1.png S2censorcompare5-2.png
CENSOR 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.
S2censorcompare6.png
  • 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.
S2censorcompare7-1.png S2censorcompare7-2.png
CENSOR Beta 4
  • A sign post was added in Beta 4.
S2censorcompare8-1.png S2censorcompare8-2.png
CENSOR 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.
S2censorcompare9-1.png S2censorcompare9-2.png
CENSOR Beta 4
  • Additional rings were removed to make room for the added Clucker in Beta 4.
S2censorcompare10-1.png S2censorcompare10-2.png
CENSOR Beta 4
  • Additional rings were removed from this section in Beta 4.
S2censorcompare11-1.png S2censorcompare11-2.png
CENSOR Beta 4

Screenshots

Videos

Files

File Type Date Size Comment SHA-1
Sonic the Hedgehog 2 (CENSOR prototype).md File 2019-02-13 01:28:54 1 MB ROM with no loader or scene edits. 9bebfb78049e7556fbef30f4a43d204fbf4c64f0
Sonic2.Smd File 1992-11-09 05:03:10 1 MB Original SMD file. 79d5b99c9546123e98802c8afd815f04a6f9cd28
Sonic2.bin File 2019-02-13 21:01:43 1 MB SMD to BIN conversion. cc29b1e9325f16cb0e66660129e861e743dab071

Header

Fixed (Sonic the Hedgehog 2 (CENSOR prototype).md)
00000100 53 45 47 41 20 4d 45 47 41 20 44 52 49 56 45 20 SEGA MEGA DRIVE 00000110 28 43 29 53 45 47 41 20 31 39 39 31 2e 41 50 52 (C)SEGA 1991.APR 00000120 53 4f 4e 49 43 20 54 48 45 20 20 20 20 20 20 20 SONIC THE 00000130 20 20 20 20 20 20 48 45 44 47 45 48 4f 47 20 32 HEDGEHOG 2 00000140 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 00000150 53 4f 4e 49 43 20 54 48 45 20 20 20 20 20 20 20 SONIC THE 00000160 20 20 20 20 20 20 48 45 44 47 45 48 4f 47 20 32 HEDGEHOG 2 00000170 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 00000180 47 4d 20 30 30 30 30 31 30 35 31 2d 30 30 26 4a GM 00001051-00&J 00000190 4a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 J 000001a0 00 00 00 00 00 0f ff ff 00 ff 00 00 00 ff ff ff ................ 000001b0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 000001c0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 000001d0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 000001e0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 000001f0 4a 55 45 20 20 20 20 20 20 20 20 20 20 20 20 20 JUE

Original (Sonic2.bin)
00000100 53 45 47 41 20 4d 45 47 41 20 44 52 49 56 45 20 SEGA MEGA DRIVE 00000110 28 43 29 53 45 47 41 20 31 39 39 32 2e 4e 4f 56 (C)SEGA 1992.NOV 00000120 53 4f 4e 49 43 20 32 20 2d 20 48 45 44 47 45 48 SONIC 2 - HEDGEH 00000130 4f 47 20 20 20 20 20 20 20 20 20 20 20 20 20 20 OG 00000140 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 00000150 53 4f 4e 49 43 20 32 20 2d 20 48 45 44 47 45 48 SONIC 2 - HEDGEH 00000160 4f 47 20 20 20 20 20 20 20 20 20 20 20 20 20 20 OG 00000170 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 00000180 47 4d 20 54 2d 33 33 30 32 33 20 2d 30 30 f5 e4 GM T-33023 -00.. 00000190 4a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 J 000001a0 00 00 00 00 00 0f ff ff 00 ff 00 00 00 ff ff ff ................ 000001b0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 000001c0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 000001d0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 000001e0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 000001f0 4a 55 45 20 20 20 20 20 20 20 20 20 20 20 20 20 JUE