Drop parts
You can hold L1 + L2 + R1 + R2 + Triangle to drop your R arm weapon, Back Unit, and Inside parts. Then hold L1 + L2 + R1 + R2 + L3 to drop Extension parts. Then hold L1 + L2 + R1 + R2 + Circle to drop L arm weapons.

Human Plus enhancements
Finish the game and load up the clear data. Now you will receive mail stating that someone wants you to beat a pilot named "Exile" and that he is really powerful and if you need an edge. Purchase the OP-INTENSITY part. It is free, but you will need every optional slot open for it.

Add defeated AC emblems
Press Select + Start when viewing a beaten AC at the victory screen to add the beaten AC's emblem to your list. A sound will verify proper entry.

First person view
Insert a memory card with saved game files from Armored Core 2 or Armored Core 2: Another Age. After saving and start playing Armored Core 3 again from that memory card, then pause the game, then press L1 + R2 + X + Square + D-pad to get a first person view of the current screen. Note: The screen will return to normal when the game is unpaused.

Finish single player mission mode to obtain the Optional Part (OP-INTENSIFY). Then save the game and equip the part. Note: It will use every slot in the AC. You must then do the things below to get the enhancements while that part is equipped. You will receive a mail when each enhancement has been made available.

Add Radar Function: Beat the Arena opponent "Thunder House".
Add Sensor Functions: Beat the enemy AC in the Eliminate Intruders mission.
Blade Wave: Beat the target in the Destroy Massive Weapon mission.
Enhanced Booster Performance: Beat Arena opponent "Ace".
Enhanced Cannon Operation: Beat the larger of the two targets in the Destroy Massive MT mission.
Enhanced Cooling: Beat the smaller of the two targets in the Destroy Massive MT mission.
Enhanced Missile Interception: Beat the enemy AC in the Defend Water Processors mission.
Enhanced Turning Performance: Beat the enemy AC in the Bomb Disarmament mission.
Improved Targetting Accuracy: Beat the enemy AC in the Defend Ruglen Laboratory mission.
Increase Blade Range: Beat the Arena opponent "Exile".

Hints & Tips

Bonus parts
Obtain an "S" rank on every mission. Depending on the mission, you will be given various parts that cannot be earned by getting a lower rank. Each mission is based on speed, damage taken, and ending price.

Defend Naire Bridge: Hidden part
There is a hidden head part on the mission "Defend Naire Bridge". Do away with all enemies on the first half of the bridge. However, before crossing the unfinished part of the bridge, fly underneath the middle section of it towards an alcove. It looks like a road that just stops. Look on the ground of the alcove and you should see a very small circular object. Tehn press Circle to pick it up. It is the hidden AC head part.

Easy arena match wins
Proceed to the "Reservoir" arena level. Then at the start of the match, boost backwards to the point where your AC is almost out of bounds (indicated by the red line on your radar). Most arena opponents will try to get behind you to strike. By using this trick you will cause them to go out of bounds. You may take some damage, but most fights will be over within ten seconds. Keep in mind that some opponents will not fall for this, but most will.

Equip Heavy Tank Legs, and the heavy EO Core. Then equip the Flamethrower L arm part and the Grenade Rifle R arm part. Then go to the "Parking Lot" level. In the beginning, move backwards into the extreme back of the corner. Wait until the opponents is close, which they almost always do, and turn on the flames while pelting them with the Grenade Rifle and the EO weapons. The enemy AC might land on your head. Just look up and keep on attacking. No AC should be able to beat you.

In the "Parking Lot", as soon as the match starts, boost backwards (into the corner). Sometimes the enemy will get caught-up on the wall and you will have up to a minute worth of free shots. Since the part of the wall covers the R arm weapon, there are only a couple of Arena opponents that this trick will not work on.

Purchase and equip the machine gun with 1000 ammo (R arm weapon), and the hovering legs at the end of the list (it is a long shaft). Strafe around your opponent in the arena while firing the machine gun. This trick usually works until you obtain rank A-3.

Destroy Massive MT: Hidden parts
There is a hidden booster part on the mission "Destroy Massive MT". When you first start the mission, turn due west and boost straight ahead. You will see hill that is in front of you. Boost to the very corner of the map (somewhere in between the yellow and red out-of-bounds line). You will now see a small, circular alcove on the backside of the hill. Look for a very small black dot on the ground of the alcove. When you spot it, stand directly over it and press Circle. You will be notified when you obtain it. Finish the mission to get the CBT-FLEET booster part (boost power 19900).

Proceed to the "Destroy Massive MT" mission. Do not obtain a consort or you will not receive the part. Attack the target however you want, but watch out for the four pursuit missiles it launches at once and the two large missiles and the four grenade rifles it has. Provided that you do not get killed, the thing will split in two. Attack the big part and beat it. Once it is dead, the mission is finished and you will receive the part.

Destroy Massive Weapon: Hidden weapon
Immediately when you start the "Destroy Massive Weapon'" mission, look down. You will see a destructible floor section. Blow it up. Go below the platform and look towards the enemy. On the railing surrounding the area is a part. Press Circle to grab it. It is a Parrying Blade that does 3,100 damage. It can be sold at the shop for 59,000 C.

Defend The Water Processors Hidden part
There is a hidden inside part on the mission "Defend The Water Processors". From where you start, go right (straight east, and go over the pipes) and back a bit (south). You will see a small object by the pipes. When you spot it, stand by it and press Circle. You will be notified when you obtain it. Finish the mission to get the MWI-DD/20 inside part.

Destroy Gun Emplacements: Hidden part
To obtain the Karasawa, you have to finish the "Destroy Gun Emplacements" mission in a short span of time. There are two guns on the shore you start out on, and three on the other side. After that, you will be asked to take part in an attack on a Union fortress. You must hold out for five minutes against a never ending onslaught of jets and Mobile MTs (the hovering type with the big cannon). When the timer get's to zero, immediately fall back to the escape point. Finish the mission and the MWG-Karasawa will be yours.

Rescue the Survey Team: Hidden part
There is a hidden extension part on the "Rescue The Survey Team" mission. The part is located in one of the sewage drains in the wall, to the left of the hallway immediately before you get to the only door you have to open in this mission (just before you meet with the construction crew). When you spot it, stand next to it and press Circle. You will be informed when you acquire it. Finish the mission to get the MEBT-OX/MB extension part.

Reservoir mission: Easy completion
This trick works best against slow/large weapons with low ammunition (Ox, etc.). Go over to the dam. Fly up onto the first little door. Land there, then target the opponent and learn how much ammunition they have left. Look up and to the left (or right). There should be another door in that direction. Fly to it while zig-zagging to avoid being hit, and having them waste ammunition. Then, go back down. You are likely to get hit once or twice. Redo this until they are out of ammunition, then kill them. Do not use this trick against machine guns or rifles. It will appear as if the dam is out of area, but it really is not.

Disable Pulse Generators: Hidden part
In the "Disable Pulse Generators" mission, you have to disable four Pulse Generators. After you have disabled the first two Pulse Generators (in the first part of the structure), proceed to the second part or the other side. When you get there, ignore the Raven that you are facing and disable the third Pulse Generator. It is located at the very bottom. Note: You should be on the other side, where the other Raven is at. Then, get to the fourth Pulse Generator. This Pulse Generator is in one of the doors with the air vents. Once you are in the room where the fourth pulse generator is at, destroy the vents on the top. Look up to locate it. When you get to it, do not disable it. Look up again to see that there are air vents that are already open. Go to it and turn left to find the Stealth extension part.

Protect Crest Convoy: Hidden part
There is a hidden radar part on the "Protect Crest Convoy" mission. It is located behind the radar dish southeast of the starting point. When you spot it, stand next to it and press Circle. You will be informed when you obtain it. Finish the mission to get the MRL-SS/SPHERE back unit.

Beating Exile
Once you have finished the main game and beat Ace in the arena, you will have to fight Exile. His skills are not so great, but his mobility will kill you. Get a heavy AC, go to the parking lot, and let him get right in your face. Then, use the flame thrower and big bazooka to attack. You will receive 1,500,000 credits for beating him. You will also gain access to the "Extra Arena" mode. In this mode, you and a teammate of your choosing can go up against two enemy Ravens at one time.

Last mission
In the final mission where you are told you need to destroy the controller, it is both a very easy and annoying task. After finishing the first section, which consists of almost nothing but MTs and laser pillars, all your ammunition and AP are restored do not worry about being stingy. In the second part, you will face two ACs at the same time who are a lot tougher than they appear. Aside from having to waste a good chunk of ammunition, they will pose little threat to a good Ravin. After this, you will enter a long shaft with MTs and laser pillars that can all get really annoying. Find out were it says target, then slash that seemingly normal yet breakable wall to expose the generator. The rest should be evident.

Leg part
In the "Garage" section, Obtain a "S" rank in both the AC tests. You will access a leg part called MLH-MX/VOLAR. It is a heavyweight humanoid leg part that is good for balancing weight and performance.

Mid-sized Rocket Launcher
When the mission where you have to disarm a poison starts, stay on top of the reservoir dam and travel east (to your left) and you will come across a back Mid-sized Rocket Launcher.

Spread Bazooka
In the mission where you have to locate a sinking ship's cargo, look in one of the cargo rooms on the ship to find a Spread Bazooka.

Alpha Custom AC

Head: CHD-SKYEYE
Core: CCH-OV-IKS
Arms: MAH-RE/GG
Legs: MLH-SS/KS
Booster: MBT-OX/E9
FCS: VREX-ST-12
Generator: CGP-ROZ
Radiator: RG1-KD99
Inside: n/a
Extension: KWEM-TERRIER
Back Unit: MWX-VM20/1
R. Arm: MWG-MG/1000 or CWA-BZ-30
L. Arm: CLB-LS-2551
Optional Parts: Your preference
Color: Base: R: 0, G: 0, B: 0
Aid: R: 0, G: 0, B: 0
Optional: R: 70, G: 0, B: 0
Detail: R: 70, G: 0, B: 0
Joint: R: 70, G: 0, B: 0

Arch-Angel Custom AC

Head: MHD-MM/003
Core: CCL-01-NER
Arms: MAL-RE/REX
Legs: MLM-MM/ORDER
Booster: CBT-FLEET
FCS: ADX-X/WS-3
Generator: KGP-ZSV
Radiator: RMR-SA44
Inside n/a
Extension: CWEM-AM40 (you can use almost all of the extensions)
Back Unit R: MRL-RE111
Back Unit L: MWM-M24/2
Arm Unit R: MWG-MG/1000
Arm Unit L: MLB-MOONLIGHT
Optional Parts: OP-INTENSIFY
Grade: Great
Note: This AC is good quality. Use the ammunition at your own discretion. The colors will vary depending on what you like.

Custom AC

MHD-MM/003
CCL-01-NER
MAL-RE-REX
MLL-MX/EDGE
CBT-FLEET
Optional Parts (vary)
Inside parts (none)
PLS-EMA
KGP-ZSV
BMR-SA44
CWEM-AM/40 (extension, missile interceptor, or whatever you prefer)
MWM-M24/2
MRL-RE/111
MWG-MG/350
MLB-MOONLIGHT
Note: This might not be the best AC, but it has a grade of "Great". Everything should be in order as it is in the AC assembly. It would be helpful to have all of the OP-INTENSIFY enhancements. As far as the optional parts, use them as you see fit. You may add almost every extension in the game, although some will make the core overweight. Colors will vary depending on what you like.

9-Ball Custom AC:

Head: CHD-Skyeye
Core: CCl-01-NER
Arms: Cal-44-EAS/24
Legs: MLM-SS/ORC
Booster: MBT-ni/mare
FCS: Vrex-F/ND-8
Generator: KGP-ZSV
Radiator: RMR-SA44
Extension: MWEM-R/24
Back R: CWC-GNL-15
Back L: CWM-GM14-1
Arm R: MWG-KP/100
Arm L: MLB-Moonlight
Optional parts: OP INTENSIFY
Color All
Base color: R: 0 B: 0 G: 0
Aid Color: R: 200, B: 0, G: 0
Optional Color: R: 0, B: 0, G: 0
Detail Color: R: 200, B: 0, G: 0
Joint Color: R: 0, B: 0, G: 0
Note: 9 Ball is reborn, With skill you, can take out the former top 3 (Ace, BB, Royal Mist) and anyone else except Exile.

Assassain31 Custom AC

Head: CHD-02-TIE
Core: CCL-01-NER
Arms: MAL-Gale
Legs CLL-01-FKST
Booster: MBT-OX-002
FCS: Vrex-F/ND-8
Generator: CGP-Roz
Radiator: Rix-CR10
Extension: CEBT-HEX (secret part)
Back R: CWC-CNG-300
Back L: CWR550
Arm R: CWG-SRF-80
Arm l: Mlb-L8-003 (good with Plus parts Or Clb-Ls-2551)
Option Parts: Op-Intensify
Note: This AC is really powerful. Use the extension only when you have that generator, because you can hover forever and Plus parts are required. This AC is very agile and deadly. The colors will vary as you like. It takes skill and intelligence to take on Ace with this AC, but it is much easier to kill Exile.

Knightmare Custom AC

Head: MHD-RE/005
Core: MCH-MX/GRP
Arms: SS/CASK
Legs: CLC-DETA
FCS: VREX-ND-2
Generator: CGP-ROZ
Radiator:RMR-SA44
Inside: MWI-DD/20
Extension: SWEL-SILENT
Back Unite R: CWM-TITAIN
Back Unite L: CWC-GNL-15
Arm Unite R: CEGG-GR-12
Arm Unite L: KWG-HZL50

Color:
Head: Base R: 0 G: 0 B: 0
Aid R: 200 G: 0 B: 0
Optional R: 0 G: 0 B: 0
Detail R: 0 G: 200 B: 0
Joint R: 0 G: 0 B: 0
All Else:Base R: 0 G: 0 B: 0
Aid R: 20 G: 0 B: 0
Opitional R: 40 G: 40 B: 40
Detail R: 200 G: 0 B: 0
Joint R: 0 G: 0 B: 0

Note: This AC does not do well against airborne opponents. It works well in the parking lot. In the hands of a good pilot, this AC can beat Ace in a few seconds. It is also rather mobile for the amount of power, defense, and AP. Its grade is Excellent.

Penance Custom AC

Head: MHD-MM/003
Core: CCL-01-NER
Arms: CAL-44-EAS
Legs: MLR-MM/PETAL
FCS: VREX-F/ND-8
Generator: KGP-ZSV
Radiator: RIX-CR14
Inside: N/A
Extension: N/A
Back Unit R: N/A
Back Unit L: MM-AD20
Arm Unit R: MWG-MG/1000
Arm Unit L: MLB-MOONLIGHT

Colors:
Head: R R, B G, B B
Base: R 50, G 50, B 50
Aid: R 0, G 20, B 40
Optional:R 0, G 20, B 50
Detail: R 200, G 0, B 0
Joint: R 0, G 0, B 0
Core
Base: R 50, G 50, B 50
Aid: R 50, G 0, B 0
Optional: R 0, G 20, B 50
Detail: R 200, G 200, B 200
Joint: R 0, G 0, B 0
Arm R
All: R 0, G 0, B 0
Arm L
Base: R 200, G 200, B 200
Aid: R 200, G 200, B 200
Optional:200, G 200, B 200
Detail: R 200, G 200, B 200
Joint: R 0, G 0, B 0
Legs
Base: R 50, G 50, B 50
Aid: R 50, G 0, B 0
Optional: R 0, G 20, B 50
Detail: R 200, G 200, B 200
Joint: R 0, G 0, B 0

Note: This AC was designed to destroy any other possible AC with a skilled pilot. Use circle strafing, a series of boosts, or zigzag strafing to easily evade anything. If boost dashing and circle strafing around the target, not even the fastest machine-gun can touch it. It is great in the arena dome or wide-open areas because it can easily close in with overboost, fire a cataclysmic hail of machine gun fire, and execute a simple finish with the blade. It can easily work with any optional parts. Once you get the OP-INTENSIFY and have all the upgrades, you could easily destroy ACs such Exile in a single try.

Hydra Custom AC

Head: CHD-SKYEYE
Core: CCL-01-NER
Arms: CAM-11-SOL
Legs: CLM-02-SNSK
Booster: CBT-FLEET
FCS: PLS-ROA
Generator: CGP-ROZ
Radiator: RMR-ICICLE
Inside: none
Extension: MEST-MX/CROW
Back Unit: CWC-CNG-300; CRU-A10
Right Arm: MWG-MG/1000
Left Arm: KLB-TLS/50
Optional parts: OP-INTENSIFY
Note: This AC is similar to Ace, but is different in a lot of ways. The strategy used with this middle weight AC is simple: Unleash all your ammunition upon the opponent. This AC carries many evasive maneuver strategies such as turning on the stealth, using its maneuverability to dodge almost any type of ammunition (simply strafe swiftly, fly in the air, or do bumble bee patterns in the air), and using the overboost to retreat. The sword is available in the event that you run out of ammunition get in close and do a bit of slashing.

Super Dragon Custom AC

Head: CHD-SKYEYE
Core: CCL-01-NER
Arms: CAL-44-EAS
Legs: CLL-01-FKST (OR) CLL-HUESO
Booster: CBT-FLEET
FCS: VREX-WS-1
Generator: CGP-ROZ
Radiator: RIX-CR10
Extension: MWEM-R/24
Back Unit R: CWM-S40-1
Back Unit L: CWM-S40-1
Arm Unit R: CWG-HG-80
Arm Unit L: KWG-HZL50
O/P: OP-INTENSIFY
Note: This AC is the "Ultimate AC" in a skilled pilot's hands It can beat any AC in the Arena. It is best in open areas but decent in closed areas. Its main goal is to out maneuver and confuse the enemy, and send them into overheat with the two main weapons used in conjunction with each other. It has a rating of "Good", but do not let that get to you. If you are good. you can defeat anyone with this AC (ACE, BB, and even Exile). The two leg options are there for those who want to change something. It works best with the lightest ones, but the main ones are more stable.

Quick Draw Custom AC

Head: CHD-04-YIV
Core: CCL-01-NER
Arms: MAL-RE/REX
Legs: MLL-MX/EDGE
Booster: CBT-FLEET
FCS: VREX-ST-12
Generator: KGP-ZSV
Radiator: RMR-SA44
Inside: -
Extension: CWEM-AS40
Back Unit-R: MWC-0C/15
Back Unit-L: MRL-RE/111
Arm Unit-R: MWG-MG/350
Arm Unit-L: MLB-MOONLIGHT
Note: If you are fond of light mechs or a fan of mirage parts, this AC is perfect for you. This mech combines medium range firepower with blinding speed. The medium range weapons will force the enemy to employ long range or low range tactics. The deadly MLB_MOONLIGHT will make short work of any who engage you in a short range fight. If the enemy has decided to employ long range tactics. all they will be able to hit is the dust left behind from your insanely fast maneuvers. This AC is great for versus and arena. The parts make this AC nearly overweight, (4557/4609), so there is not much room for upgrading. OP-INTENSIFY is optional.