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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It's difficulty comes from how unclear the directions can be.
Apparently back then if I'm understanding correctly, the kata expected "int[]" to be returned instead of "HashMap<String, int>" despite saying that it needs to be an HashMap. So now, it's fixed but there's still backwards compatibility for "int[]" solutions.
This should be 7 kyu IMO. Feels weird to do a difficult 5 kyu for hours, then finish another 5 kyu in just 5 minutes.