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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.
This is the first kata I gave a "not satisfied" rating. While the problem itself was nice, the challenge well described and the level of difficulty adequate, the test cases should not fail due to a comment that came with the description! Especially not with a challenge that is several years old and where others remarked on that problem years ago. The test found the bigraph "os" in a word in a pre-given comment? Seriously?