Sonic Month 2019

Difference between revisions of "Sonic the Hedgehog 2 (Sep 14, 1992 prototype)"

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Revision as of 18:13, November 9, 2019

Title Screen
Sonic the Hedgehog 2 (Sep 14, 1992 prototype)
Build date Sep 14, 1992
Build name Pre Beta
Dump status Released
Dumped by drx
Released by drx
File release date November 10, 2019
Origin EPROMs
Lot Sonic Month 2019
Labels MD S2 Pre Beta 14.9
Dump method True-USB PRO GQ-4X
Ownership drx (2019-Present)
Game Sonic the Hedgehog 2
System Sega Mega Drive
Genre Platform
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 (Sep 14, 1992 prototype) (info, raw dump)

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

Notes

  • The title screen is different in comparison to the final. This is currently the first available build that contains a selectable 1P/2P mode on the title screen.
  • Cheat Codes:
    • Level Select - A + Start.
    • "Night Mode" - C + Start.
    • Two-Player Mode - on the level select, press B + Start.
    • Debug Mode - on the title screen, press C, C, Up, Down, Down, Down, Down, Up. Then hold A while selecting a level from the level select.
  • None of the unused zone IDs contain any data aside from an associated music ID.
  • Hidden Palace Zone is still listed on the level select, but has been cut and cannot be accessed.
  • An earlier title card is present. The title card in its current form can often display erroneous tiles if the name of the level is too big (for example, Neo Green Hill Zone displays some tiles for the bubble graphics).
  • The Spiny badnik is blue instead of red in this build.
  • The bottom/underwater segments of Aquatic Ruin Zone have been implemented and are a little different in comparison to the final build.
  • The ring/object layout of Casino Night Zone is noticeably different in comparison to the final.
  • While not present on the stage itself, the Crawl badnik is present in the object list and uses the early design. However, the badnik itself is impossible to destroy even as Super Sonic.
  • All levels can be played, but Sky Chase, Wing Fortress, and Death Egg cannot be beaten.
  • The level transition from Sky Chase to Wing Fortress hasn’t been implemented yet.
  • The Wing Fortress boss has not been implemented yet, instead two turrets are in its place.
  • Wing Fortress lacks the Clucker badniks even though the stage is set up for them and that they are present in the stage’s object list.
  • The Tornado is only shot at once in this build.
  • Wing Fortress contains significant object layout differences in comparison to the final build, such as the end segment.
  • The level transition from Wing Fortress to Death Egg hasn’t been completely implemented yet.
  • Metal Sonic repeats his moves twice in comparison to the later builds.
  • The final boss is incomplete. You cannot land a hit on the final boss regardless of invincibility or rings. The boss moves much faster. After a while, the boss will get stuck in a pose and will remain that way until the timer runs out.
  • The special stage has been implemented but is very incomplete. The ring counter uses three digits rather than two, there is a traffic light that illuminates before the special stage begins. The timer resets when it reaches zero. Sonic's jump sprite as well as the rings are using different sprites. The special stage lacks sound effects. The special stage loops infinitely until the game is reset.
  • The end credits medley has been implemented but sounds slightly different in some parts.


Screenshots

Videos

Files

File Archive Contents

File Type Date Size SHA-1
Sonic the Hedgehog 2 (Sep 14, 1992 prototype).md File 2019-09-07 03:56:15 1 MB 24d6451a1ac72837cc2d88b93138677b5d043ae6

Header

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


Origin

See also