I agree, but not 4. It's not a 2, but definitely not a 4 either. 3 is good.

arbitrary is far from how the ranking works

kata ranks are decided by users who have completed the kata in the beta phase. it can't be edited after being approved

also note that different languages share kata kyus.

I agree. The kata ranking on this website seems to be quite arbitrary.

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.

All katas seem very simple and easy if you know how to solve them. Different story if you start from scratch without having an idea on how to approach the problem.
Some katas that I spent 8-12 hours working on just a few weeks prior seem ridicolously simple to me now.

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 came here specifically to say this and saw that you already did. I wrote a lot of extra code to handle parentheses and realized after submission that none of the top solutions handled them.

true

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

thanks for the links.

No need, there is already this and this

.

surely beacause he didn't solve the kata in the same language than you did

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

Why can't I see your solution?