The exit badge.

how to get:
near the "come a little closer sign". there is a weak brick wall that can be exploded by the c4. you must block the train's way. then once you blocked it you must find the weak brick wall. it's easy to find since it doesn't really blend in with the brick walls. you can push through it or explode it. once you done that you will see a black and pink square room. there is a invisible pathway. make sure to always zoom your camera on the pathway. once you touch the exit. you will get the badge.



important thing:
do not listen to the audio. you must help newbies to find all badges.