Armored Core 4 Cheat Codes

Hard mode

Complete a chapter to unlock the hard difficulty setting for any mission in that chapter. Press L1 or R1 to toggle between chapters and and then press Square to switch between the normal and hard difficulty for any mission.

Easy money and schematics
Select a good AC to start with then get to at least Chapter 3. Start 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.

300 FRS Points, the easy way
Normally, after completing the normal playthrough and all simulator battles, a player should have 263 FRS points. To acquire the remaining 37, a player must S-rank each mission in Hard mode, however, there is a simpler trick to achieving 300 FRS points.

Requirements

• Normal mode completed (this is a must)
• Simulator completed (have not checked, but better safe than sorry)
• Hard mode accessible (this is a must)

Now select a relatively easy HARD mode mission (for this, I chose Hail of Bullets) and proceed to complete the mission, achieving initially a rank of LOWER THAN S.

Then, upon completion of the mission, replay the same mission, but this time, acquire an S-Rank on it, and you will receive your FRS point. Now you may repeat that mission, and for each time you S-Rank it, you will receive another FRS point, up to the maximum 300.

I have tested this on Regulations 1.10, and confirmed this works. Other tests done by other players confirm this works as well on Regulations 1.00.

This will allow players to achieve 300 FRS without having to S-Rank every hard mode mission.