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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 are missing the fact thay you get language points for solving one kata in many languages. Overall progress is awarded only once, but language progress is awarded separately.
If you do not care about points for other languages, you can unlock solutions in this language by clocking "unlock solutions" in kata trainer.