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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.
Another view could be ranking according to test complition time.
Solutions aren't displayed randomly yet. This is definitely an area that needs more focus and we intend to make some changes soon. Randomly showing solutions that aren't already up voted is probably the first step. Providing a couple of different views (latest, most popular, most concise, most creative, etc) is another approach we have been throwing around.
Some sort of "trending" view would probably help a lot too, where it excludes the up votes coming from maybe the top 5 solutions and focuses on the most recently up voted ones instead.