アーマード・コアシリーズ
A stand-alone expansion, "", was released on January 23, 2003 and was a direct sequel to "Armored Core 3". Like other expansions in the franchise, players could import their progress from "Armored Core 3" into "Silent Line", retaining their parts and credits from the earlier game. "Silent Line" introduced new gameplay mechanics, including computer-controlled companions and a first person mode.