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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.
That's not really a feature request. However, you can follow your friends and then view "Solutions of Users I am Following". Keep in mind that one can refactor his/her solution. Furthermore, the runtimes aren't reliable (and therefore not shown).
How to do a single kata with a group of friends to see who is the best?