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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.
Make a fork, add the tests you want.
Sudoku does not only require the sum to be 45, it requires the presence of all digits from 1 to 9 in every region without repetition. This is very different from only having the sum 45; because a board with a 5 in every cell will satisfy the sum constraint because 5*9=45.
I am disappointed with the tests.