Armored Core 4 Cheats

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Hard mode:
After finishing a chapter you will unlock the hard difficulty setting for any mission in that chapter. Press L1 or R1 to toggle between chapters and then press Square to switch between the normal and hard difficulty for any mission.

NEMAHA01 Relation Missile:
After finishing Chapter 3 Mission: Go Up in Flames in Normal Mode

HLR01-CANOPUS Hi Laser Rifle:
After finishing Chapter 4 Mission: Sea of Blood in Normal Mode

050ANSR Sniper Rifle:
After finishing Chapter 4 Mission: Empress in Normal Mode

07-MOONLIGHT Laser Blade:
After finishing Chapter 5 Mission: Garden of Chevalier in Normal Mode

09-FLICKER Flash Rocket:
After finishing Chapter 5 Mission: Garden of Chevalier in Normal Mode

EUPHORIA PA Molder:
After finishing Chapter 5 Mission: Marche Au Supplice in Normal Mode

ADDICT PA Charger:
After finishing Chapter 5 Mission: Marche Au Supplice in Normal Mode

051ANEM ECM Maker:
After finishing Chapter 5 Mission: Marche Au Supplice in Normal Mode

BVS-50 Large Rocket:
After finishing Chapter 2 Mission: Citadel of Sandstorm in Hard Mode

AB-HOLOFERNES Side Booster:
After finishing Chapter 2 Mission: Desert Wolf in Hard Mode

BIGSIOUX Large Missile:
After finishing Chapter 3 Mission: Internal Purge in Hard Mode

JADORE PA Molder:
After finishing Chapter 4 Mission: Defense Line in Hard Mode

IBLIS Shotgun:
After finishing Chapter 5 Mission: Shower of Bullets in Hard Mode

INSOLENCE Kojima Cannon:
After finishing Chapter 5 Mission: Silent Avalanche in Hard Mode

MR-R102 Rifle:
After finishing Chapter 5 Mission: Soldios in Hard Mode

S04-VIRTUE Main Booster:
After finishing Chapter 5 Mission: Garden of Chevalier in Hard Mode

BLUEXS FCS:
After finishing Chapter 5 Mission: Garden of Chevalier in Hard Mode

MADNESS/XA Kojima Weapon Arms:
After finishing Chapter 5 Mission: Marche Au Supplice in Hard Mode

EC-0307AB Laser Cannon:
After finishing Chapter 5 Mission: Marche Au Supplice in Hard Mode

MP-0601JC PM Missile:
After finishing Chapter 6 Mission: Seed A Hostile Earth in Hard Mode

Get easy money and schematics:
Choose a good AC to start with then get to at least Chapter 3. Begin fighting the sim ACs in the ACSIS menu. A good amount of money is given out per fight, and as a bonus you get the defeated AC's emblem and schematic. You can use the defeated AC schematics to defeat more ACs because you only need a buildable AC to start a mission, and not a sim. The only drawback is that you can only use AC schematics that can be tuned to a certain level. If you have enough points to tune the AC up then you can use it, otherwise it will be highlighted in red instead of yellow or white. You can also use schematics earned in the sim online.
User Cheat by Abraham