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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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It is not enough if you take a valid solution and replace all 2's by 1's and all 8's by 9's, you still get sum 45 but it is not a correct solution.
columns and squares are also checked
What will happen if you get this row [9,9,9,9,5,1,1,1,1]?
I think to check if the sum is 45 isn't enough