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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.
How's it not a kata issue? I too was surprised a 4 kyu was so straightforward and easy. Searching for katas with "too easy" in comments is a good way to rank up quickly I guess, if nobody's willing to fix the scoring.
Not a kata issue, and ranks can't be changed.
Issue:
Being too easy or too hard is not an issue.