i promise to not tell anyone :P

Wow, thanks for trying so hard to find it!

I’ll give you a hint: You may need to look somewhere that is not yet reachable.

I think is something on the last level(the one in the surface museum) but we dont have mines to break the doors(i think is the one that leads behind the elevator)

what the heck does “You may need to look somewhere that is not yet reachable” mean? Are you saying floor 51b hasn’t been added yet?

…perhaps ;)