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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.
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Thanks! I saw it now, can't believe I missed that
It's already in the description. There is also a link to Wikipedia.
Not everyone knows the rules of Sudoku to understand that there should not be repeating numbers in one block. I would add this to the description
Look harder at the last two columns.
Just missing where this test case is invalid while debugging my code, been staring at it for a bit so thought I'd just ask:
[[1, 3, 2, 5, 7, 9, 4, 6, 8]
[4, 9, 8, 2, 6, 1, 3, 7, 5]
[7, 5, 6, 3, 8, 4, 2, 1, 9]
[6, 4, 3, 1, 5, 8, 7, 9, 2]
[5, 2, 1, 7, 9, 3, 8, 4, 6]
[9, 8, 7, 4, 2, 6, 5, 3, 1]
[2, 1, 4, 9, 3, 5, 6, 8, 7]
[3, 6, 5, 8, 1, 7, 9, 2, 4]
[8, 7, 9, 6, 4, 2, 1, 3, 5]]