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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.
Thank you for raising this issue. There's already an active issue about this problem, so I'll close this.
There are sudoku with multiple possible solutions within the random tests.
For example for [[3, 4, 1, 2], [1, 2, 0, 0], [4, 3, 2, 1], [2, 1, 0, 0]]:
Both,
=> [[3, 4, 1, 2], [1, 2, 3, 4], [4, 3, 2, 1], [2, 1, 4, 3]] and
=> [[3, 4, 1, 2], [1, 2, 4, 3], [4, 3, 2, 1], [2, 1, 3, 4]] are valid.