Add defeated AC emblems
Press Select + Start when the victory message appears in the arena to add the beaten AC's emblem to your list.

Hints & Tips

Defend Solar Power Plant mission: Secret Part
After you bbeat every enemy on the outside of the power plant, you should receive a notice about enemies inside the plant after you go in. 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 secret part is the KWEL-EJ22 anti-missile.

Destroy AI Prototype mission: Secret part
On the ground in a small room closed off by destroyable gates is the left arm part KSS-SS/707A.

Defend Lawdas Factory mission: Secret part
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.

Defend Mirage HQ mission: Secret part
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.

There is a back part on the roof where the MWM-SM36/1 stealth missiles can be located.

Explore Unexplored Region mission: Secret part
Go into the crater to come across a plane. Shoot the back end of the plane to destroy that section. Inside the plane is the back part MWC-OC/30.

Infiltrate New Base mission: Secret part
In a cave in the center of the map is the extension part MWEM-R/36.

Investigate mission
Go to the first door, access 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 goes to. Destroy every box to find the left arm part KWG-NHZL60.

Destroy Cargo Transport mission: Secret part
Use a fast AC for this mission. When you see the first intersection, instead of turning right with the transport, turn left and jump behind the center barricade and get the part. It is the inside floating mine, CWI-FMHS-30.

Eliminate Bio Weapon mission: Secret part
At the first room, turn left and keep shooting all over the wall. When you uncover a secret passage, follow it to the part. It is a PRAYYING BLADE.

Eliminate Rioters mission: Secret part
When you get to the most top level and enter, a box will be destroyed by enemies. On the floor is the inside part KWL-RJ/60.

Search Vilius Laboratory mission: Secret part
Search the bottom of the deepest pit to locate a part guarded by a MT. It is the left arm part MWG-KPL/150.

Secure Fortress NK-432 mission: Secret parts
Locate the room filled with plenty 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.). The right arm part MWG-GS/80 can now be found on the ground. Use your map near the first target to reveal 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.

Takeover New Fortress mission: Secret part
When you fight 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.

Protect Part Transport mission: Secret parts
Wait until the plane has landed, then get behind the it. Shoot the back end until the door explodes. Then press Circle next to the part to get the right arm part CWG-ARF-180.

When the mission starts, turn around and make your way to the left storage room. Go inside and get the part. It is the left grenade rifle CWGG-GRSL-20.

Safeguard Alloy Sample: Secret part
Destroy every enemy MTs and the AC Grinder. The Transport Truck must survive to the Crest's Headquarters. After the mission is over, you will receive new mail from Crest stating that you will get the extension part booster CEBT-HEX.

Easier Arena wins
Select the Trene City area. When the battle starts, there is a big building in the middle of the Arena floor. Boost up to the top of the building and assault the opponent AC full of rockets or other types of ammunition that can lock on. If you are unable to boost up the whole way, there is a ledge halfway up. Rest there a second, 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 quick to do this to. They move to much to get a lock on. If this occurs, when you start, boost West and position yourself in between two buildings 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 come near 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 a bit time consuming, but a very easy way to boost ranks early.

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. Change 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 of the fight.

Hydraulics
Attain a robot with the tank wheels. Then press X continually and it appear as if the robot has hydraulics.

Bonus parts
For every mission you get an "A" or "S" rank on, you will receive a special bonus part.

These 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.

Note: This core is an upgrade from its earlier tank model from Armored Core 3. It is the same as last time, except for more boosting and defense. Again, keep the chain gun on the back left so that the arm shield will not deactivate. The machine gun should only be a back up weapon, and the DD/20 should only be used for missiles. The core has so much defense that it can take the punishment of the Titan arm weapons and the new Titan back weapons and have AP remaining.

Note: This AC looks best in dark colors he may be very slow, it packs a nice punch. Its AP is 9094 and with the plasma rifle you can nail most MTz with a single blow with the ELIX without worrying about energy consumption. The EO on the core gives you an extra edge in battle. The overall grade is "Great".

Note: This mech is useful for a number of missions, and mostly for easy victories in the Arena. If you like sheer power rather than rapid-fire weapons, then this is the mech for you. Also, for this mech to live up to its name, customize the colors to make the base black and all the details gold.

Note: This is one of the fastest middle weight ACs out there. It is also a good flier and is very expandable.

Note: Though Falcon is slow, it packs a good wallop. It has an AP of 9,704. There are some things that you can improve tho so experiment a little. Falcon's grade overall is "Excellent". It does not have a big slot requirement for optional parts, but it has enough to improve turning speed, reduce shell based damage, reduce energy based damage, and improve lock-on coverage. It looks good with white, red, and blue.

Note: This is a mostly mission-based AC. Finishing the game before you use this AC is suggested, due to knowing what you are up against in the sorties (missions). You have a fixed amount of ammo; do not miss and you will be just fine. The usage drain from boosting is not too bad. The cooling is better. The only downfall is when over shooting the Karasawa. Keep track of your booster gauge, and when it gets too low, let off. It will regain very fast.

Note: This AC is well balanced, and has good weapons. This AC's left weapon is a dual energy laser. It almost always hits other ACs in the Arena. This AC is good in the Arena and some missions. You can keep this AC in air for a long time, shooting with the machine gun in its right arm.

Note: Do not let its low AP fool you. This AC is almost unstoppable in the arena if you know how to dodge the enemy fire. You can switch the head for the CHD-04-YIV head, change extensions to CWEM-R20 and pick whichever FCS fits you best. This AC works best in the Arena level; do not use it for missions.

Head: MHD-RE/005
Core: CCH-OV-IKS
Arms: CAH-22-NIX
Legs: CLC-D3TA
Booster: none
FCS: VREX-F/ND-8
Generator: CGP-ROZ
Radiator: RMR-ICICLE
Inside: none
Extension: MWEM-A/50
Back Unit R: CWC-GNL-15
Back Unit L: CWC-GNL-15
Arm Unit R: MWG-KARASAWA
Arm Unit L: MLB-MOONLIGHT
Optional part(s): OP-INTENSIFY

Note: A well built AC converted from Armored Core 3. It is good for both missions that need tanks and arena fights. The KARASAWA gives good firepower and can be used as much as you like since tanks do not use much energy. The grenades are great AC killers and of course do a lot of damage against targets such as the big flying MT in the Test New Technology mission. It moves slow, but overboosting in short bursts and the weapons themselves can make up for that. It has over 9000 AP and an overall rating of "Excellent".

Note: This AC has 7,549 AP and an overall grade of "Good". If you know how to pilot it properly, you can easily take out other Acs. However, by the time you get all of these parts, you are done with the Arena except for perhaps the lower ranks that appear next.

Note: With the proper amount of speed, power, and the skill of a veteran Raven, you can be unstoppable. Shinobi has 7,110 AP and has a grade of "Good". The R Back unit MWC-LQ/15 gives him a good kick and the 800 round machine gun hardly lets you run out of ammunition. The Crow keeps ypu safe from most enemy locks. This Core in the Arena is nearly unbeatable. Some enemies like the Silver Fox could pose a threat, but you will eventually beat him.

Note: A really high mobile AC that is an really good mission AC. The twin chainguns make killing ACs and the controller AC such as MTs a lot easier. The machine gun is for killing smaller MTs and when out of the chainguns. It can be used in the arena effectively with a skilled pilot. It has an overall rating of "Excellent".

Note: This AC weighs a lot (9336), but can take a punch and hit back really hard. It is fast for its size, with its moving ability being at 155.

Note: Some of the parts are from Armored Core 3. Other parts are only available from Silent Line. For this AC to function you need to have enhanced cannon performance for OP-Intensify. It would also improve its handling if you had the enhanced booster performance. This AC has 8754 AP, it is very fast, and with its powerful booster you can dodge missiles fired at you easily. The grenade cannon on its back does not have as slow a fire rate as the more powerful grenade cannon, but still packs a nice punch for taking out tougher opponents. The slug gun on the back does nice damage at close range and is an added insurance that you will hit the target. With this AC's extension you can turn towards him a lot faster, which helps in close range or if someone is behind you. The machine gun on the right and left arms are best used at the same time while boosting sideways so you have better accuracy; they really strip the AP.

Note: This AC is overweight and is only meant for the Arena. An experienced pilot is suggested. It is slow, but powerful. There is plenty of ammunition. When you are out of ammunition with a weapon, then drop it. It will make your AC more mobile. Learn how to use it, you will be unbeatable.

Note: This AC is suggested for the Arena. An experienced pilot with skilled shooting is needed. The Core is the hardest part to get. This AC has good combos for shooting: Use the Back Unit R (TR90-1) with the Extension on, and also use the Core's EO. It will run other AC's AP down fast. You may also use the grenade launcher on the left arm. It will run down even quicker. It can kill any AC in less than a minute. However, this AC is really low in mobility.