That's true, I've had the idea of how to solve it as soon as I have read the task. But it's also true for a few other katas of same and different levels. So, my conclusion was based on comparison between theese. Basically, what i'm saying is that i've solved katas with similar complexity that had 3rd or 4th level and i've solved katas of the same level, which were much harder. I think this diversity formed because of difference of time a kata was published: older ones seem to be overrated in comparison with newer ones. Although, i think you point is fair as well.

Actually, there are this pretty similar kata with parentheses tests: https://www.codewars.com/kata/52a78825cdfc2cfc87000005. I have come across it after solving this one.

I see, didn't know it worked that way...))

Definitely too simple for 2kyu. It should be 3 or even 4...

Why can't I see your solution?

Convention about 80-characters max lines is there for a reason. It's impossible to read.

No test cases for parentheses (((

It is clever, but it's not a best practise for sure. Read description of "Best Practices" label before clicking.

number of rows isn't the best, your code should be easy to read and understand

I'd say it's too easy for 5kyu...