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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 hard-coded this solution as I forgot about the third rule in Sudoku: Each sub-grid needs to contain the numbers 1-9. After I read the comments (I only read them after I pass all the tests), I realized my error. I went back and accounted for the third rule in Sudoku and was able to pass all the tests without cheating / hard-coding.