Tower Inside [A4 Sector] 227~225F, 塔内【A4区画】227~225F?, lit. "tou-uchi [ei-yotsu kukaku] 227~225ef") is one of the internal sectors of the First Tower of Ar tonelico, and is accesed through the Dividing Gate located in the upper tunnel of Silvaplate. This place has several rooms with branching paths, which make it into a maze, and it's the only way of reaching the lower parts of the Tower without resorting to an airship. At the end, there is a shuttle that leads to Tower Inside A3 Sector 195~183F.