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Proto:Sonic 3D Blast (Genesis)/73 Prototype

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This is a sub-page of Proto:Sonic 3D Blast (Genesis).

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Download.png Download Sonic 3D Blast (73 Prototype)
File: Sonic 3D Blast (73 Prototype).bin (2 MB) (info)

Prototype 73 of Sonic 3D Blast, dated July 3, 1996, was released by drx during the February 23, 2008 proto release. It is the earliest dated prototype of the game released so far.

General Differences

  • The Sega logo has the old "Sega" sound, and shatters at the end (like when you get a Game Over) instead of the letters zooming off the screen.
  • No intro movie is played (before starting a game, and after starting the game).
  • No level select is available.
  • No game demos play.
  • Platforms move back and forth with no pause.
  • There is no 1-up sound. The final version plays the sound from Sonic and Knuckles.
  • There are no title cards for each level.
  • Special stages are absent in this build, as are Knuckles and Tails.
  • Pressing A when the game is paused will skip to the next level.
  • The level complete screen is very basic, with no final score tally.
  • Blue Flickies run in circles, while purple Flickies behave like a mix of the final green and red ones (move randomly and jump).
  • The invincibility, Speed Shoes, and Fire Shield powerups are all absent. Not even their art is present.
  • The player has to press C to make Sonic jump from the Goal Ring if fewer than five Flickies have been collected.
  • All levels use the Green Grove Act 1 music, while all bosses use the Final Fight music.
  • The ROM is only 2MB as there is so much content yet to be added, all newer builds are 4MB.

Aesthetic Differences

  • No dust appears while doing the Spin Dash.
  • When pausing the game, the "Pause" text does not appear.
  • The title screen is similar to several other prototypes released by drx, as well as the Saturn version:
    • The lighting is completely different.
    • Sonic's skin is a lot darker in the final, for some reason. Here it resembles the Saturn version.
    • The prototype image is cut off slightly, and uses the 256-pixel wide screen mode at 256x224. The final game uses the standard Genesis screen mode at 320x240.
    • The eyes of the flickies were touched up a bit for the final.
    • The flower under Sonic's glove was redrawn.
    • Sonic's limbs are thinner in the prototype.
    • The placement of the background trees is different.
    • The prototype has a sky background, like the Saturn version, while the final has no background.
    • The ring underneath Sonic was rendered and placed differently.
    • No "Press Start" text is present, which is specific to this build.
Prototype 73 Final
Sonic3dE3screen.png Sonic 3D Blast-title.png
  • Some of the monitors have their art incorrectly applied:
73 Prototype Final
Sonic 3D Blast (Prototype 73 - Jul 03, 1996, 13 001.png Sonic 3D Blast (Final - Sep 11, 1996, 11 004.png
  • There is a bug which makes the Gold Shield a strange green/red color on some stages. They otherwise act normally.

Level Changes

Green Grove Zone

  • There is a Blue Shield close to the cannon in Act 1, instead of a Gold Shield.
  • There is a spiked ball near the first giant ring, which also isn't in the final.
  • No water splashing effects.
  • The floor tiles are brighter:
Prototype 73 Final
Sonic3dbtilesgreengroveproto73.png Sonic3dbtilesgreengrovefinal.png
  • Near the cannon, there is a shield on a hill. In the final, it's in a slight dip.
  • There are no rings in Act 3, although ten rings are already given at the beginning of the Act.

Gene Gadget Zone

  • This Zone does not yet have a boss.

Rusty Ruin Zone

  • The first two Acts are flipped compared to the final version.
  • When Sonic is spun like a top, he is not invulnerable to enemies.
  • Slight changes to the Act layouts.
  • After beating the boss, you're sent to a screen with the text "To Be Continued". When the music ends, the game returns to the Sega intro.


(Source: Sonic Retro)

Unused Music

There are two unused music tracks. They were used in the game over screen and level select in the final version. To listen, go to Green Grove Zone and put this code: FF0F3E:00xx
05 "Game Over"
06 "Level Select"