Sonic the Hedgehog CD (Aug 1, 1993 prototype)

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Title Screen
Sonic the Hedgehog CD (Aug 1, 1993 prototype)
Build date Aug 1, 1993 16:24:41
Dump status Released
Dumped by drx
Released by drx
Origin CD-R
Labels Sonic CD 8/1/93 ver 1.05
Dump method CloneCD (3 dumps, drive: DS8A8SH)
Ownership drx (2017-Present)
Game Sonic the Hedgehog CD
System Sega CD
Genre Platform
Final build JP Aug 6, 1993
EU Aug 27, 1993
US Oct 12, 1993
Release date JP Sep 23, 1993
EU Oct 1, 1993
US Nov 19, 1993
Download Sonic the Hedgehog CD (Aug 1, 1993 prototype) (info)

A late prototype of Sonic the Hedgehog CD for the Sega CD.

Notes

The Cutting Room Floor research
  • Level select can be activated at the title screen by pressing B
  • Minor code changes in all files.
  • Wacky Workbench Act 2 (Past and Good Future) and Stardust Speedway Act 2 (Present and Good Future) contain the most differences in this build (R62B, R62C, R72A, R72C).

Palmtree Panic Zone Act 2 (R12A/B/C/D__.MMD)

A critter that jumps around in good future is removed in the final:

   054E 028E A401 E000

A spring and a rock that stop you were added in the final. The goal post is also moved to the right in the final.

   26C8 02D2 9600 E000  (goal post)

is replaced by

   2628 42D8 0A0A 2000  (spring - past)
   2630 42D0 0A0A C000  (spring - present, future)
   2730 02C4 9600 C000  (goal post - present, future)
   2738 02CB 9600 2000  (goal post - past)
   27A0 02E0 1B00 E000  (rock)

Metallic Madness Zone Act 2 (R82B__.MMD, R82C__.MMD)

The prototype has two places where Mini Sonic can fall through the wall in Metallic Madness Act 2. The final adds the following two objects which act as barriers to fix this bug:

   0910 0710 0900 2000
   1A20 0110 0900 E000

The block causing the first bug was also reinforced with collision on the top and bottom so that even if you fall into it, you won't fall through the bottom any more. The column causing the second bug was also reinforced making it entirely solid. In the prototype, it has collision holes in the top corners and it's hollow inside.

Mmz2b tile.png Mmz2c column.png

Quartz Quadrant Zone Act 3 (R53C__.MMD, R53D__.MMD)

The boss in both good and bad future has a different color

Good Future

Bad future

The background in Bad Future starts higher than in the final.

Visual mode (VM____.MMD)

In builds 712 and 801, there are 5 patterns that are loaded into the same place in Video RAM in succession (overwriting each other). The last pattern (#5) is changed between 712 and 801, fixing the OPENNING typo. Patterns #1-#4, which presumably show the development progression of the Visual Mode are removed in the final, leaving only pattern #5.

Pattern 712 801 Final Image
#1 Sonic CD VM text 1.png
#2 Sonic CD VM text 2.png
#3 Sonic CD VM text 3.png
#4 Sonic CD VM text 4.png
#5 Sonic CD VM text 5 712.png
#5 Sonic CD VM text 5.png

OPENNING typo

Screenshots

Videos

Files

# File Type Size SHA-1
1 Sonic the Hedgehog CD (Aug 1, 1993 prototype).ccd Track list 7.6 KB e9da0992bd2bad2e4c8739d2a83a6cedf4b22d2c
2 Sonic the Hedgehog CD (Aug 1, 1993 prototype).cue Track list 2.3 KB 11bd0bb10179a032b35f1290552992625254ebaa
3 Sonic the Hedgehog CD (Aug 1, 1993 prototype).img Disc data 556.41 MB a284870b1cfe8c43c48969a6b229f807b79028e2
4 Sonic the Hedgehog CD (Aug 1, 1993 prototype).sub Subchannel data 22.71 MB 7a35aab38fa2a2f0f9fcd6acfd9c7a78ad46ac9e

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 33 2e 41 55 47 (C)SEGA 1993.AUG 00000120 53 4f 4e 49 43 20 54 48 45 20 48 45 44 47 45 48 SONIC THE HEDGEH 00000130 4f 47 2d 43 44 20 20 20 20 20 20 20 20 20 20 20 OG-CD 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 48 45 44 47 45 48 SONIC THE HEDGEH 00000160 4f 47 2d 43 44 20 20 20 20 20 20 20 20 20 20 20 OG-CD 00000170 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 00000180 47 4d 20 47 2d 36 30 32 31 2d 31 30 20 31 30 35 GM G-6021-10 105 00000190 4a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 J 000001a0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 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 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 J

Origin