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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.
You can also manually change the sample input tests to anything you want to test. You won't break anything.
You can always check test input: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#how-can-i-see-which-input-causes-my-solution-to-fail
it would be nice if we had more sample tests with bigger numbers. I mean I passed the first three, but while attemtping. I got a LOT of errors. It's really hard to find the bugs if you don't see the example input.