This installment in the Armored Core series is to be the last for the PS2. Follow the story of the highest ranked Raven ever.
- One of the 2 modes, Training Mode, an extensive AC Test, with 150 battle scenarios to play through, replacing missions with 'simulations' of them.
- And Arena Mode is the same as you may have played in AC2 or 3. For the majority of the arena, opponents are randomly genereated, but for the higher ranking opponents, they are pre-made.
- The AC Modification system is used more than any other game has seen, tweaking the smallest parts of your mech for the smallest bit of extra boost, stability, or armor.
- Transfer your mechs from Nexus over to Nine Breaker to help you get a head start.