When skinning gameplay elements, complete sets of elements must be skinned. For instance, if you skin hitcircles, you must include a hitcircle.png, hitcircleoverlay.png, approachcircle.png, and a slider border color (this can be done by adding the line "SliderBorder: 255,255,255" (using RGB values) under the [Colours] section of each .osu file). The same logic applies to hitbursts, cursors, numbers, and anything else of this nature. If you didn't intend to skin an element in the set, then using the templateskin's version is okay. Setting a SkinPreference is also acceptable (e.g. forcing the default skin).
https://osu.ppy.sh/wiki/Ranking_Criteria#Skinning
They most likely being reworked atm by ranking criteria friends(c), tho someone was a bit rapid to remove sets listing from the wiki. So it would be nice to get clarify how they (skin sets) should be treated at the moment.
https://osu.ppy.sh/wiki/Ranking_Criteria#Skinning
They most likely being reworked atm by ranking criteria friends(c), tho someone was a bit rapid to remove sets listing from the wiki. So it would be nice to get clarify how they (skin sets) should be treated at the moment.