Currently, PGC uses OSM level 4 data ('regions') for the german 'states' ('Bundesländer'), and level 6 data ('counties') for the next lower level ('Landkreise'). Level 6 seems to be the lowest possible. However, in the 'city states' Berlin, Hamburg and Bremen, there are no 'counties' but they are directly subdivided into level 9 'districts' ('Bezirke').
Question is now if this limit to level 6 data can be avoided or eliminated when using Challenge checkers for these regions that only have level 9 subdivisions?