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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 think there is something wrong with Golang random tests. My solution passes all "Larger tests" (from 5 to 50 and 100), but somehow fails on all random. I thought my code was bad, but after few more clicks on "Attempt" it becomes green. :)
Try few more times and sometimes it passed and sometimes it failed without any code changes.