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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 agree. I've been using Codewars to learn Kotlin and this has blocked me way more than the actual solution :)
If you'd like to post your code here, and mark it as spoiler, we can offer advice or comments on it.
Also, there are some tests with some very long selectors (1000 parts), so it might be getting bogged down in those.