A blue Nine Ball appears in the cover of Armored Core: Formula Front Extreme Battle. Despite this, it plays no role in the game.
Upon beating the game, the player can watch the credits where four Armored Core: Nexus ACs are fighting. The four are Bullet Life, Ferrum Slave and two others who have yet to be identified.
The Crest Assault Type from Silent Line and the Mirage model AC from AC3 intro ACs are featured prominently in the intro video.
Formula Front is the first Armored Core game to be released on multiple platforms, originally on the PlayStation Portable and later on the PlayStation 2. In Japan it was released simply as Armored Core: Formula Front. In America the game was modified and released as Armored Core: Formula Front Extreme Battle, however the PlayStation 2 version was not released in North America. The American version of the game was then re-released in Japan entitled Armored Core: Formula Front International; this re-released Armored Core: Formula Front International edition is considered to be the ultimate edition as it also contains a large amount of additional battles not found in the American version of the game, and includes both Japanese and English text options (except for the tutorial videos which are only in Japanese).
The two versions of the game allow for data transfer via USB, letting players exchange mech data between the PSP and PS2.