Hi --> I found it was my comments that contained banned characters that caused the problem. So I stripped out all the comments and it passed. Might be worth looking at. Depending on which language you use you might also find certain 'banned methods'.

what is your big o? mine is O(n^1.5). i guess i still have to make it more efficient

I'm having the same problem in Python

remember the original given set-up in codewars:

Array.prototype.remove_ = function(integer_list, values_list){
  //your code here
}

and that you are defining a prototype for Array and not a free-standing function . . .

not sure what your problem is, but hope that helps :D

mmm, it's in there, but I forgot the last part of the sentence, yeah... x)