Sonic Unleashed (SD)

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Sonic Unleashed

Developer: Dimps
Publisher: Sega
Platforms:PlayStation 2, Wii

Sonic Unleashed is a 2008 platform video game in the Sonic the Hedgehog series. The story follows Sonic as he attempts to restore the world after his nemesis Doctor Eggman shatters it with a powerful laser to unleash Dark Gaia, an ancient evil, while dealing with having become a "Werehog", a werewolf-esque transformation, which he gains after coming into contact with the energy of Dark Gaia. Gameplay features two distinct styles, with each being played either during daytime or nighttime. Daytime stages incorporate Sonic's traditional platforming and trademark speed, with a combination of behind-the-back third-person viewpoints and 2D side-scroller platforming; gameplay seamlessly transitions between these two views.

This page describes the version released for the the Wii and PlayStation 2, commonly referred to as the SD version. The other versions of the game are the "HD" version released for the Xbox 360 and PlayStation 3, and the mobile version developed by Gameloft.

File Formats

  • .onz/.one (Archives)
  • .gno (Models)
  • .gvr (Textures)
  • .adx (Music and voices)
  • .nut (Squirrel scripts)


  • Skyth's xno2dae (listed in the Sonic '06 section), to convert models.
  • Puyo Tools for browsing/extracting .onz/.one archives, and viewing/converting textures. This tool doesn't seem to open some textures from the Wii version however, though it works with those from the PS2 version.
  • DKDave's GCAX tool for the extraction of sounds in GCAX audio packs. You can play them back in foobar2000 if the .txth is in the same directory as the files, and you have the vgmstream plugin.

Filesystem (Wii)

  • \adx - Music and most voice clips.
  • \one_wii
    • \capital - Files for each "hub"/town area.
    • \load_etc - Miscellaneous items, cutscene subtitles, NPC talksprites and text (in .fco), models and textures of the world map, etc.
    • \load_main_game
      • \common - Sonic's character models.
      • \etc - Mostly HUD textures, with some scripts and camera movement files.
      • \stage___ - Stages. Each common_save.onz contains the stage's models, textures, objects/gimmicks, and enemies. common_dump.onz contains set data, particle data, and .dat GCAX sound packs (including additional voice clips for Sonic/Werehog). Area_.onz contains .hkx collision and splines/paths.
    • \scenario - "SceSeqTbl.nut"


If you want to rip stages from this game in order to port them into another game, here's all the stage collision ripped by Gotta Play Fast:

VG Resource Pages

PlayStation 2