1. Your osu!mania skins will be automatically migrated into the skin.ini file regardless of your skin version. All changes listed below will likewise automatically be applied with this conversion. No changes to nK.ini files after this point will have any effect.
2. The following defines the structure for osu!mania skins inside skin.ini:
   

   [Mania]
   Keys: 4
   JudgementLine: 0
   ...(Other properties here)...)
   
   [Mania]
   Keys: 5
   JudgementLine: 1
   ...

   Note that the Keys property determines the number of keys for which the skin applies to. The above examples will apply to 4K and 5K respectively.
   
   
3. The property BarlineWidth has been renamed to BarlineHeight.
4. The property ColumnLine has been removed.
5. The property ColumnLineWidth has been reworked and now contains comma-split decimal values defining the widths of the column lines. Example:
   

   [Mania]
   Keys: 4
   ColumnLineWidth: 2,2,2,2,2

   Or:
   
   

   [Mania]
   Keys: 4
   ColumnLineWidth: 2.8,2.8,2.8,2.8,2.8

   Note that there must be Keys + 1 amount of values.
   
   
6. The property SpecialPositionLeft has been removed.
7. The property SpecialStyle has been reworked with possible values:
   

   0 - No special style
   1 - Left special style
   2 - Right special style

8. The property FontCombo has been replaced by ComboPrefix and ComboOverlap under the [Fonts] header. Example:
   

   [Fonts]
   ComboPrefix: score
   ComboOverlap: 0

9. The property NoteImage#T has been added where # is the column, for skins version 2.5 and higher. This allows you to skin the 'tail' note of mania sliders the same way as the head note and body. Example:
   

   [General]
   Version: 2.5
   
   [Mania]
   Keys: 4
   NoteImage0T: Arrows\leftT

10. The property ColumnSpacing has been added which allows you to increase the spacing between columns. Example:
    

    [Mania]
    Keys: 2
    ColumnSpacing: 5

    OR
    
    

    [Mania]
    Keys: 4
    ColumnSpacing: 5,5,5

    Note that the number of values is equal to the number of keys - 1.

1. The properties ComboPrefix and ComboOverlap have been added under the [Fonts] header. These properties will be used for all skins version 2.4 and higher and affects the combo counter font during play. Example:
   

   [Fonts]
   ComboPrefix: score
   ComboOverlap: 1

smoogipooo wrote:

The property FontCombo has been removed. You should now use the property ScorePrefix under the [Fonts] header. Example:
Code:
[Fonts]
ScorePrefix: default

smoogipooo wrote:

How does a ComboPrefix property under the [Fonts] header sound instead?

1. osu!mania first tries to use the font specified in the specific keycount, if not available, use ComboPrefix, if not available either, use ScorePrefix.
2. Other game modes use ComboPrefix if available, otherwise, use ScorePrefix.

1. The property NoteImage#T has been added where # is the column, for skins version 2.5 and higher. This allows you to skin the 'tail' note of mania sliders the same way as the head note and body. Example:
   

   [General]
   Version: 2.5
   
   [Mania]
   Keys: 4
   NoteImage0T: Arrows\leftT

2. The property ColumnSpacing has been added which allows you to increase the spacing between columns. Example:
   

   [Mania]
   Keys: 2
   ColumnSpacing: 5

   OR
   
   

   [Mania]
   Keys: 4
   ColumnSpacing: 5,5,5

   Note that the number of values is equal to the number of keys - 1.

smoogipooo wrote:

It's one of the next items on the list

smoogipooo wrote:

[*] The property ColumnLineWidth has been reworked and now contains comma-split decimal values defining the widths of the column lines. Example:

[Mania]
Keys: 4
ColumnLineWidth: 2,2,2,2,2

Or:

[Mania]
Keys: 4
ColumnLineWidth: 2.8,2.8,2.8,2.8,2.8

Note that there must be Keys + 1 amount of values.

ColumnLineWidth: 0,0,0,1,1,0,0,0

BanchoBot wrote:

This issue has been addressed by the following change by smoogipooo:

Fix ColumnLineWidth not working as intended.

It will be applied to builds newer than b20141222.10.

Please follow up in this thread on the status of this issue after you have tested it. If it has not yet been resolved, please provide any new details that may have arisen since before this change.

Redon wrote:

Can you explain why? I can't think of any advantage to this change. Instead, it makes changing key-specific ini settings more annoying than it used to be. It turns the skin.ini file into a bloated mess. It limits the ways in which I can exchange different versions of key ini files: I used to be able to keep different copies of each ini file with different color settings, and exchange any of them individually, without having to open a file and copy-paste sections of it into another. If greater flexibility is your goal, I think this is not the way to go.