Enter the northwest room and examine the terminal for a quest of retrieving a paradox source. Go check the southeast room with Chocolina inside, and look up in one of the corners to locate a treasure cube. Toss Mog at it to retrieve the Paradox Agent Type A , then bring it back to the terminal in the northwest room for AF200 AUGUSTA TOWER FRAGMENT - Idea Circuit (02/04) + 400CP !
Now check the other terminal, who wants you to retrieve another paradox source, located somewhere on Floor 49.
Here we have three circular walkways and two rooms - southeast and southwest. Go southwest to the middle walkway and operate terminal No.2 once to turn the room, then go through the southwest room to the outer walkway and head north. Along the west side of the room look for a treasure cube - toss Mog at it to get Paradox Agent Type B .
Loop around the outer walkway to reach the crystal gate - activate it to unlock AF300 Oerba , then return to AF200 Augusta Tower. Continue going north on the outer walkway, ignore the terminal and use Moogle Hunt on a concealed treasure to get a Gold Casino Ticket. Return to the terminal and operate it once to turn the southeast room and go through the room to reach the middle walkway.
Now walk north and look down towards the northeast. You'll spot a treasure all the way down in the depths. Align your Moogle Throw properly and Mog will grab the Paradox Agent Type C item. Return to Floor 50.
Give the item to the terminal for AF200 AUGUSTA TOWER FRAGMENT - Enigma Codex (03/04) + 400CP !, then examine the third terminal in this room. This one wants to have another paradox source removed, and it's hidden somewhere on Floor 49... but we already collected it. In return you get AF200 AUGUSTA TOWER FRAGMENT - Difference Engine (04/04) + 400CP ! As an additional bonus you also get Access Key 13 .