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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.
Well, I wrote this - but others did cheat and copy my solution, without understanding what is going on.
Or even changing something.
What can I say?
This kata is not easy - it requires deep knowledge on how the Java SecurityManager works - and the SecurityManager has been deprecated now for a while, so finding people with the right skillset to solve this Kata is hard.