Armored Core 3: Silent Line Hints (PS2)

Following the destruction of the machine run society of Layered, mankind has slowly begun the process of returning to the surface and repopulating the face of the globe. All is well with mankind, or so the corporations would lead you to believe, but things are looking up. Reconnaissance teams are sent out all over the world to search the land and determine what has changed, and everything seems to be reachable; except for one area that continually eludes scouting. All attempts to investigate this region are met with complete loss of contact from the exploratory units. Anything that attempts to cross the line goes silent; thus, this demarcation becomes known as the 'Silent Line.'
What is behind the Silent Line? Why does everything that crosses it goes missing? As a Raven of Global Cortex, you are sent to the Silent line to discover exactly what is behind it. Be on your guard, Raven! Something sinister could be lying in wait...

(Wikipedia)

GAMEPLAY HINTS

Defend Lawdas Factory mission: Hidden 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: Hidden 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 found.

Defend Solar Power Plant mission: Hidden Part

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.

Destroy AI Prototype mission: Hidden part

On the ground in a small room closed off by destroyable gates is the left arm part KSS-SS/707A.

Destroy Cargo Transport mission: Hidden part

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.

Eliminate Bio Weapon mission: Hidden part

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.

Eliminate Rioters mission: Hidden part

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.

Explore Unexplored Region mission: Hidden part

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.

Here's a gameplay video: