I am having the same issue

EDIT: never mind, solved it, turns out I was reading for length before checking if the array is null or not. thanks to @Chrono79

What the description means is that if a player has reached the final tile, all subsequent calls should return "Game over!".

your code mutates the input

You should add console.log(s) at the beginning of your function to see the whole input.

And that's not your only problem but the * quantifier is greedy...

Closing the issue since it's a problem with your code, not a problem with the kata itself.

Please provide language (JavaScript?) and your code, cause it is difficult to give you any advice without info. Maybe you should check edge cases - empty string?