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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.
you can check the codewars status to see if there is downtime, but even if there is, this is not a kata issue as this is not something kata authors / contributors can fix.