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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.
Thank you for your reply. Actually, I had realized the point, after a while I wrote this issue. No problem, now :)
It would be great if the instructions of the question were explained clearly for the people who don't know what Sudoku is. For example, instead of saying that "Rows may only contain integers", I recommend that the uniqueness of the integers must be mentioned in that sentence clearly.
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