Armored Core 3 - Platform: Playstation 2

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

First person view
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Insert a memory card with saved game files from Armored Core 2 or Armored
Core 2: Another Age.
After saving and resuming in Armored Core 3 from that memory card, pause
game play, 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 resumed.

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

Bonus Optional part
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Successfully complete the game and load up the clear data. You will receive
mail stating that someone wants you to defeat a pilot named "Exile" and that 
he is very powerful and if you need an edge.
Buy the OP-INTENSITY part. It is free, but you need every optional slot open
for it.

HNP-590 Plasma Cannon
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Defeat Ace in the Arena and AC "Nine Ball +" in the mission "Destroy Crest
Mainframe". You will receive a mail stating you have a prototype "HNP-590" 
plasma weapon. Check your parts to find it. Be careful, as the cannon's 
recoil can break your AC's core or overload the generator.

Easy arena match wins
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Go to the "Reservoir" arena level. At the beginning 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 in behind 
you to attack. Using this trick will cause them to go out of bounds. 
You may take a little damage, but most fights will be over within ten seconds. 
Keep in mind that some opponents will not fall for this, but most will.

In the "Parking Lot", as soon as the match begins, boost backwards (into the
corner). On occasion 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.

Buy 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
up until rank A-3.