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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.
So... yes, it is not complete private (aryan-firouzian answered it)
Had the same issue with C#. After reading the error output I researched C# extension methods. Hint: it has to do with the class being named incorrectly.
Last night they were doing server maintenance. I'm guessing they dont have everything back up and running yet. I'm getting the same 504 error.
No, if someone wants to see the solution, she has to sign in, and later unlock the solution. This procedure prevent potential cheating.
Does codewars allow for your solutions to be publicly viewed by others?