Please guide me with some help on this :c  Go to the Warchall: Live LFI challenge

Hi WeChall!

I'm stuck on this LFI Challenge. I understand the rules of what's Not to go in there, so I have tried URL Encoding. I've tried once, but that fails because of the rules above. I tried double encode but file not found.
Is the solution inside the dir of itself? meaning I don't need to dot dot down a dir?

Should I be using something else that isn't Url encoding?

I'm so sorry if there's any spoilers. I hope not!

Thank you so much!!
RL.

You need to look *very* closely inside solution.php

But how?!