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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.
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In description for task written: ...contain all of the digits from 1 to 9.
What for write more than required?
In the game of sudoku only the numbers 1..9 are used, if use numbers 10 and/or 0 in the game then this another game.
columns and squares are also checked