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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.
That's not an issue.
I think you've got it a little confused. Here is an excerpt from the Kata details:
In ["NORTH", "EAST", "WEST", "SOUTH", "WEST", "WEST"], "NORTH" and "SOUTH" are not directly opposite but they become directly opposite after the reduction of "EAST" and "WEST" so the whole path is reducible to ["WEST", "WEST"].
This seems to say that to 'reduce' two directions they must be consecutive. So your example, '['NORTH', 'WEST', 'SOUTH', 'EAST']', can't be reduced further. If it were N-S-W-E, it would reduce to [], but that's not how this Kata is set up.
The test are correct, 1728 guys passed the JS kata.
I have exactly the same issue. Solved the problem, on my irb everything works perfectly fine, all the tests are passing, yet the Attempt to submit final fails.