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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.
I used python
Insufficient tests. Sudoku rules checked only in squares but not in rows or columns. Instructions incomplete as well.
That is true but it is not specified in the instructions that it should be validated as well. It only says that the squares may only contain integers in 1..N range.
Very nice kata. It is great when there is a short, simple solution once you understand the problem.