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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.
I guess you have to be clever to pass the tests without solving the problem.
BECAUSE THAT'S WHAT PEOPLE VOTED FOR
How is this an issue (= a bug in the kata)? Please read the documentation: https://docs.codewars.com/training/troubleshooting/
This is a hard kata.