Gameplay
The player assumes the role of an "Architect". An Architect is a person who builds, programs and battles with a modified Armored Core known as a "u/AC" or an Unmanned Armored Core. u/ACs are AI controlled Armored Cores which compete exclusively in battling tournaments. u/ACs battle independent of the Architect's control, so the Architect must influence how the u/AC fights by customizing various part combinations and loading various program functions into the u/AC's AI. The North American version of the PSP game has since been modified to allow players the option of actually piloting their u/AC in battle instead of letting the AI fight for you. In the game, this is called a "N-u/AC" ("N" standing for Naked) and is supposedly notoriously hard to control.
Read more about this topic: Armored Core: Formula Front