Gadvia:Unused Difficulties
Gadvia has three difficulty levels accessible in game: Neritic (easy), Photic (normal) and Bathyal (hard). However, there are clues in the game that more difficulty levels were planned for the game.
Abyssal - the fourth difficulty level
In the game files, there is a mention of Abyssal right next to Photic and Bathyal, and it is speculated to be the fourth difficulty level.
Strings of global-metadata.dat:
... FullComboClear*FullComboClear_Photic,FullComboClear_Bathyal,FullComboClear_Abyssal ...
Hadal - the fifth difficulty level
In a different place, there is also a mention of Hadal Charts, right next to Abyssal Charts.
Assets/Level/Localization/IAP/IAP_en.asset:
...
- m_Id: 113061098327801859
m_Localized: Abyssal Chart
m_Metadata:
m_Items:
Array: []
- m_Id: 113061098327801860
m_Localized: Hadal Chart
m_Metadata:
m_Items:
Array: []
...
Ribbon texture files
There are five "ribbon" texture files in the Assets/Texture2D/ directory, named ribbon-1.png through ribbon-5.png. Ribbon files are used by the game for the colored ribbon on the corner of a song art when entering a song. ribbon-1.png (blue), ribbon-2.png (yellow) and ribbon-3.png (red) are used for Neritic, Photic and Bathyal respectively. It is speculated that Abyssal and Hadal charts would've used ribbon-4.png (pink) and ribbon-5.png (purple).
Unused chart files
In Gadvia, chart files have filenames ending with D1, D2 and D3, for Neritic, Photic and Bathyal charts respectively. In the game's files, 60 charts with the suffix D1, 60 charts with the suffix D2, 60 charts with the suffix D3, and 2 charts with the suffix D4 have been found. It is speculated that chart files ending with the suffix D4 are Abyssal charts.
The two charts with the suffix D4 are: