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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.
@akar-0 Thanks for the advice, the difficulty is definitly in the back tracking, but like mentioned, the test results are inconsistent and it makes it hard to debug.
The tests are randomly generate, you just have to get lucky and not run into bugged one.
It could have been a good test but proving sudoku has single solution requires backtracking, which make the job time out, mainly because of the 200 random tests.