I'm working on the mission in Final Fantasy XIII-2 which requires you to bring fully explored maps to someone in Academia -400 AF-.
Sometime after exploring all I could of Augusta Tower -200 AF-, I noticed I acquired a Key Item called Access Key 13. Using this key to explore the 13th Floor of Augusta Tower -300 AF-, I was able to reach 99% map completion.
Much to my dismay, I discovered a sliver of unexplored area on the 12th Floor. The problem is, when I try to use the elevator to head down there, I get the message, "Access key 13 confirmed," and it sends me to the 13th Floor. If I try from there, I get the same message and am sent back to the 15th Floor.
Can I ever return to the 12th Floor, or is the completionist in me doomed to cry a little?