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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.
Tests are good!
Try harder!
This comment is hidden because it contains spoiler information about the solution
Look the numbers in regions 3x3.
In every region you have duplicate numbers:
ex.
first region 3x3
1 2 3
2 3 4
3 4 5
As you can see 2,3 and 4 are duplicated, and there are not all the numbers between 1 and 9, so it returns 'Try again!'.