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Proto:Sonic Unleashed (Xbox 360)

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This page details one or more prototype versions of Sonic Unleashed (Xbox 360).

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The Xbox 360 Preview build of Sonic Unleashed is a debug build from in between the E3 demo and final build, predating the latter by almost two months. Unfortunately, only the first disc of this build has been found and dumped, and the second is most likely lost, but even the disc that we have has a wealth of differences compared to the final. The build date is unknown, but three were found.

  • Disc Label: 1/09/2008 (September 1st, 2008)
  • XEX file: 31/08/2008 22:41:02 (10:41:02 PM, August 31st, 2008)
  • Developer Menu: Revision 6005 06:50:59 4/21/2008 (6:50:59 AM, April 21st, 2008)

All the build dates are different, but we can estimate it. The Dev Menu seems to be "subversion", explaining the odd build date. The disc was burned on September 1st while the XEX file is dated August 31st, suggesting the disc was burned the next day.


Sound Differences
Lots of placeholders.
Cutscene Differences
Somewhat unfinished at this point, with many visual changes and missing sounds.

Early Animations

Preview Build Final Game
Preview Build Transformation SU.gif SU Final Game Anim.gif

The lighting is much more 'shiny' than the final game, and the scene as a whole was redone.

Preview Build Final Game
Spring Animation SU Beta.png Spring Animation SU Final.png

Sonic faces up in this prototype while in the final he faces down.


Preview Build Final Game
Preview Build TitleScreen SU.png Sonic Unleashed (Xbox 360)-title.png

The title screen was simplified from a view of the cracked planet to a star field, and "Press Start" was changed to "Press Start Button".

Preview Build Final Game
SonicUnleashed360-PRE StageSel.png SonicUnleashed360-FIN StageSel.png

Likewise, this menu was also simplified for final, with the prototype design resembling the Miles Electric; strangely, internally, the Preview menu is "OldMainMenu", suggesting it was already being replaced.

General Differences

  • This build targets 60 frames per second, like the final PS3 release. Despite this, all versions (including Xbox 360 final) rarely manage to reach that cap.
  • All upgrades are unlocked from the start, and the player's stats are always maxed out, likely for testing purposes.
  • Early versions of the game's DLC is included in here, likely explaining why the build couldn't fit on one disc.

Graphical Differences

  • While the HUD in the Hedgehog levels is mostly finalized, the Werehog still uses the earlier HUD from the E3 build.
  • The homing reticle hasn't been changed from E3 yet.
  • Sonic's model has been updated since E3 and uses the final model, but still retains certain particle effects such as the jumpball effect.
  • This version contains the higher resolution global illumination maps that are normally bundled with the DLC.

Early Savannah Citadel

To do:
Upload a screenshot of the collision in a level editor.

While the level model and textures are missing, the collision and object layout for a version of Savannah Citadel resembling an early trailer can be found.

Debug Commands

Install Menu

SonicUnleashed360-PRE InstallMenu.png

To access, press Left on the title screen.

Sequence Check Menu

SonicUnleashed360-PRE SequenceChk.png

Can be accessed by pressing the Left Stick and X, pressing again closes it.

Developer Menu

SonicUnleashed360-PRE DevMenu.png

Press LB, RB and B to access the Developer Menu, pressing it again will exit it.