Sonic Unleashed/Hidden content
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PS2/Wii versions
Unused alternative "Day Act" layouts
Both Day Stage and Night Stage missions often consist of sections from the main Acts' maps that utilize alternative object layouts from their Atc couterpart, but often enough, some daytime missions take part in areas from completely alternative Day Stage maps. Those maps were most likely planned to become the "Day Acts 2" of the respective locations where they exist, but said Acts might have been scrapped thanks to tight development schedules and were instead converted fully or partially into multiple missions.
| Rooftop Run |
Alternative map 1 (4 areas):
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| Dragon Road |
Alternative map (3 areas):
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| Arid Sands |
Alternative map (3 areas):
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| Jungle Joyride |
Alternative map (4 areas):
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Absent/empty layouts
In Cool Edge and Eggmanland, the alternative day maps only contain empty area files or area files with a single flat plane collision (without object layouts or graphic terrain files), so alternative zones for those zones never truly got into the game. Windmill Isle is the only zone that already has two Day Acts, so it doesn't have any alternative layout for a third.
Every map as some extra empty area files, probably placeholders to account for possible map expansions during the development process. No Day (or Night) Stage layouts for Empire City or Mazuri are present in the game's files (apart from some unused textures), hinting to possible exclusion since early in development.
Unused mission layouts
As both Day Stage and Night Stage missions most often only partially utilize the areas from either the main Acts' maps or the alternative Day Stage maps (whith the exception of some "Time Attack! Race for the goal!" missions) and possess alternative object layouts, there are usually leftover layouts hidden out-of-bounds in the usused areas from said missions, not rarely concealing some surprising easter eggs.
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Unused Item Capsule
In Windmill Isle's Use those arms to get acrobatic! Tutorial Mission, there is a unused 1UP Item Capsule hidden from the player's sight in an area only accessible during the Night Act 1, where there is usually a Secret Item Capsule. The item is non-functional, however, so it's presence seems to imply that the game was originally going to follow a more "traditional" approach to the 1-Up system then it ended up taking.
X-Box/PS3 versions
Level Changes
Jungle Joyride Act 1 Night: Original Ending
After the Goal Ring in Jungle Joyride's main Night stage, there is a sealed door. By using the wall-walking glitch, it is possible to cross through this door. There is a large, unused, empty chamber within. If accessed from the ghost mission instead of the main level, the door will be open, and there will be objects within. There is a tree which can be knocked down and used as a bridge, floating platforms, and switches that raise the water level. The platforms and the kill zone raise, but the room's unique water level puzzle is clearly unfinished- the water graphics remain in place. At the top of the room, there is a door. Beyond the door is an ornately detailed chamber containing the original Goal Ring.
This area is used, in modified form, in the Adabat and Empire City Adventure Pack DLC.
Arid Sands Act 1 Night: Unused Area
After the Goal Ring in Arid Sands' main Night stage, there is a sealed door. By jumping onto it from a well-positioned water barrel and using the uppercut, followed by the midair 
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combo, you can fall into an unused canyon area. It's empty, but you can open the sealed door from the other side. Bring water barrels to the bottom of the chasm, stack them, and do and uppercut-grab to go on. There is a huge chunk of level which is empty. Go on through it. There are, among other things, two pillars you can knock down, which don't appear elsewhere. Eventually, you will reach a pit, which is uncrossable without objects to bridge the gap. Beyond it is a fairly large stretch of level, leading up to the Gaia Temple.
This area is used, in modified form, in the Apotos and Shamar Adventure Pack DLC.
Strange Files
Several files on the game disc are never used.
E3 Title
"E3title.ar" and "E3Title.arl" are present on the game disc.
Both versions
Region Names
Examining the contents of the game disc reveals what some of the regions' prototypical names. Some of them had the names of the real world locations they were based on.
- Adabat - SouthEastAsia, Sea
- Apotos - Mykonos
- Chun-nan - China
- Eggmanland - EggManBase
- Empire City - NYCity
- Holoska - Snow
- Mazuri - Africa, Clay Castle
- Shamar - Petra
- Spagonia - EuropeanCity, RedRoofs
For comparison, a list of the areas and the locations they were most likely based on would be:
- Apotos - Mykonos, Greece
- Mazuri - Great Mosque of Djenne, Djenne, Mali (continent of Africa)
- Holoska - Alaska?
- Spagonia - Sienna, Tuscany, Italy; London, England; Madrid, Spain
- Chun-Nan - Great Wall of China, Yanqizhen, Huairou District, Beijing, China
- Shamar - Petra, Jordan
- Empire City - New York City, New York, USA (with Central Park as the hub world)
- Adabat - Angkor Wat, Angkor, Cambodia (location); Thailand (flag)
Hidden cameos
In the opening cutscene and the one where Dark Gaia rises towards the end of the game, inside Eggman's Eggpod there's a Dreamcast and an Eggman game of some sorts, which seems to be a parody of Sonic Adventure. There is also a NiGHTS game using art from NiGHTS: Journey of Dreams.
In the EggmanLand World Hub, the robots there are named after Previous Sega consoles and games.
In Spagonia, at night, in the first alleyway to the right, the player can hear someone singing the Sonic Unleashed theme, which sounds eerily similar to what Sonic whistled in the teaser.
References
| Sonic Unleashed | |
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Main page Manuals Development |
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