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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 nearly impossible to change a kata's rank once it has been set. The process of doing so is disruptive and labor-intensive and for that reason, it is almost never done. Something would have to be egregiously wrong with a kata's rank to get re-ranked (like a 1-kyu rank with an 8-kyu difficulty level).
i think he was being sarcastic lol.
ninja code means not clear naming?
Around 4 hours i'd say