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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.
yes it all changed and your points were updated according to the new "rules". But this calculation only happens when you connect yourself after the change. So your friend's scores are still the old one if they did not come back here.