Agreed -> https://www.codewars.com/kata/sudoku-solution-validator/discuss/javascript
This one seems older according to the comments' timestamps. (It's a shame that Codewars doesn't display some "date of creation" right at a kata, or does it?)

8 kyu plz. this is nothing

this is real determination. Great job

I can't solve it. Your comment make me feel stupid

Very satisfying Kata. ThankS !

lol . Easy points for all of us.

This is one of the easier 4kyu kata.

There is one identical problem but classified as 4 kyu. Obviously one must be wrongly classfied

I saw two players with 1 dan ranking