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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.
Me too! I can't get it to work with any of my challenges
Close window, reopen codewars and log back in again? I've had your issue happen before, and that's solved it each time. Presumably I was being logged out from inactivity, after not submitting or testing a kata for long period of time, or just from being logged in to long.
Not related to the kata, must be a website problem.
The website auto-scale in size depending on browser window size (including smartphone being rotated) maybe the button is hidden because the screen is not wide enough? I know some buttons vanish when this is the case at least.