Glad you are enjoying the course.
I assume it’s this course (as there are others with that same title):
You are partly correct:
Level 2 is “Part 1 (Painting and Artist)” and Level 6 is “Part I (Artist and Painting)”.
On all courses I’ve created or supported I’ve created “Reversed” levels which do use the same data.
MemRise presents the data in BOTH directions while learning, but once fully ‘planted’ then when watering or reviewing it is ONLY in the direction intended by creator.
People use the reversed levels in one or more of three ways,
1) to check that they know the items or when returning to it a few months later to have a refresher.
2) if they prefer to water in one direction rather than the other.
3) to only choose the level they prefer - as often one is easier or suits them better.
If you go to level 2 and go to water you will find you are only ever presented with a PAINTING and have to guess the artist.
Once you have fully learnt level 6 you will find when you review it, you are only ever presented with an ARTIST’s name and have to identify which of four painting s/he painted.
Hence the level titles.
I hope that has clarified how “Reversed” levels work.