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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.
In C#, I'd suggest making the provided test case initialize a jagged array instead of the [2,5] array because that's what the real test cases use.
There's even 2 more above 12345678 for c#. I agree, definitely not a 6kyu problem unless the big number test cases are taken out.