Note: This game is also titled Armored Core 3: Silent Line.
When the victory message appears in the arena, press Select + Start to add the defeated AC's emblem to your list.
Find any mission that has an advance payment. Start the mission and immediately abort it. After this is done, you will see your earnings displayed in two boxes. One box is for your new money amount that was earned and one for the deductions for repairs, ammunition, and the special deduction in the event that something was destroyed that was not supposed to. Note: There is no deduction, and you will get the amount that was promised to you in advance. Make sure to save your game before you do this, as the game will end if this is done too many times.
Select the Trene City area. When the battle begins, there is a big building directly in the middle of the Arena floor. Boost up to the top of the building and pummel the opponent AC full of rockets or other types of ammunition that can lock on. If you are unable to boost up the entire way, there is a ledge halfway up. Rest there momentarily, then boost the rest of the way. Weapons that are the most effective are the small rockets and/or vertical missiles. There are some enemies that are too fast to do this to; they move to much to get a lock on. If this happens, when you start, boost West and position yourself in between two buildings very close to the border. Most of the enemy ACs will not go behind because they will lose. They will just move back and forth trying to get a fix, but will not approach you if you are very close to the border. Pop in and out from behind the building and shoot various rockets and missiles as the ACs are moving around. It is slightly time consuming, but a very easy way to boost ranks early. Also, take your opponent to the Arena stage. Have Hectos Rockets and the left hand grenade launcher equipped. When the battle starts, start stepping backwards, making sure not to turn or alter where the aimer is pointed. Switch weapons to the Hectos Rockets and keep firing those with the grenade launchers. The opponent will just follow your steps, and will not move from the line of fire. If they get too close, start to fight normally; they will have low AP at this point.
Get a robot with the tank wheels. Press X repeatedly and it appear as if the robot has hydraulics.
Never use the big missile for the back unit with the extension for vertical missiles; you will just blow up your missile when you launch it.
If you use a certain type of leg part (light weight leg, middle weight leg, hover, etc.) for enough missions, a "prototype" part will be unlocked in the shop. The prototypes are usually good. This may also be the case with other parts as well.
When the big laser destroys the missile in the center of the map, jump down and look for the part. The part is an extension CWEM-RT16.
When the mission starts, turn around and boost towards the helicopter landing site. Look around the landing site to find the back stealth missile, MWM-SM36. Also, there is a back part on the roof where the MWM-SM36/1 stealth missiles can be found.
After you defeat all the enemies on the outside of the power plant, you should get a notice about enemies inside the plant after you enter. Clear the first floor. When you go down the ramp at the end of the first part, you will see a fork. Go to the left. There should be the part at the end of the room. The room is on fire. The hidden part is the KWEL-EJ22 anti-missile.
On the ground in a small room closed off by destroyable gates is the left arm part KSS-SS/707A.
Use a very fast AC for this mission. When you see the first intersection, instead of turning right with the transport, turn left and jump behind the middle barricade and get the part. It is the inside floating mine, CWI-FMHS-30.
At the first room, turn left and keep shooting all over the wall. When you reveal a secret passage, follow it to the part. It is a PRAYYING BLADE.
When you reach the most top level and enter, a box will be destroyed by enemies. On the floor is the inside part KWL-RJ/60.
Go into the crater to find a plane. Shoot the back end of the plane to destroy that section. Inside the plane is the back part MWC-OC/30.
In a cave in the middle of the map is the extension part MWEM-R/36.
Go to the first door, unlock the control panel, then search for the second one. In the room where there is a ventilation duct, shoot the duct. Fly up, then go down into the other room it leads to. Destroy all the boxes to find the left arm part KWG-NHZL60.
Wait until the plane lands, then get behind the it. Shoot the back end until the door explodes. Press Circle next to the part to get the right arm part CWG-ARF-180. Also, when the mission starts, turn around and go to the left storage room. Go inside and get the part. It is the left grenade rifle CWGG-GRSL-20.
Destroy all the enemy MTs and the AC Grinder. The Transport Truck must survive to the Crest's Headquarters. After the mission ends, you will receive new mail from Crest stating that you will get the extension part booster CEBT-HEX.
Search the bottom of the deepest pit to find a part guarded by a MT. It is the left arm part MWG-KPL/150.
Find the room filled with lots of boxes. Do not destroy any boxes with red triangles or any boxes on top of red triangle boxes (the top box destroys the one under it, etc.). The right arm part MWG-GS/80 can now be found on the ground. Use your map near the first target to find a secret passage behind the wall. Destroy that part of the wall and follow the secret passage until you reach a room with one box. Destroy the box to find the head part MHD-MX/BEE.
When you battle against the two ACs fly up into the giant hole in the ceiling. When you look up, there should be a pipe that runs from one side to the other. On top of the pipe is the FCS part PLS-SRA02.
For every mission you get an "A" or "S" rank on, you will get a special bonus part. The following are the other requirements to get bonus parts at the store:
- MRL-MM/001: Reach AC rank "D"
- MWGG-HNRL-100: Reach AC rank "C"
- KAW-SAMURAI2: Reach AC rank "B"
- MAM-MX/MDD: Reach AC rank "A"
- MBT-NI/GULL: Reach AC rank "S"
- CWI-DD-30: Defeat E-21 at the Arena
- RGI-KDA01: Defeat E-15 at the Arena
- KWG-NHZL30 : Defeat E-8 at the Arena
- CWR-M70: Defeat D-7 at the Arena
- CWM-BM60-1 : Defeat C-7 at the Arena
- MWG-SRFE/8: Defeat B-4 at the Arena
- MCL-SS/RAY: Defeat A-3 at the Arena
- MWG-MG/FINGER : Defeat A-1 at the Arena
- CWM-HA40-8: Defeat rank 1 in Extra Arena
- MWG-HGB/108: Rank "S" in all missions
- KGP-ZXV1: Complete all missions
- CCL-02-EI: Complete 10 missions from Crest
- MCM-MI/008: Complete 13 missions from Mirage
- KEEP-ELIX: Complete 7 missions from Kisaragi
- Op-Intensify (All Abilities): Obtain 99% completion of the game.
- MWGG-HNRL-100: Reach AC rank "C"