Armoured Core 2: Arena Battles

1st Hidden part:
In the training room, if you shoot the circle in the ceiling enough, it will break, revealing a secret area. You need good boosters or a light-weight AC to get up the shaft into the area, and when you do, you will
find a new Radar part. The radar is pretty nice for the 1st half of the game.

2nd Hidden part:
On the mission where you have to destroy the giant radar dishes there is a hidden part: When you stand at the doorway facing the dishes, to the right of them are large cargo containers close to the edge of the
area. The doors to these containers can be blasted open. The first four or so are empty, but if you go around behind them, right up against the edge of the area (don't go too far!) is a container that holds a hidden part.

3rd Hidden part:
There's a hidden shield on the stage with the "monster" disorder unit. Before you start going down through the floor, stand on that entrance (or in front of it, if you blasted it open), and look up. Shoot open the
damaged-looking oval almost directly over you and fly into the hole, and there it is. I don't know if there's a better shield in the game (prefer dodging to blocking).

Create overweight AC's:
After beating the mission mode the first time in Armored core 2, you can create overweight AC's! This means you can use your AC, even though it is overweight. You must get the end-of-game credits for this to
become active.

Easy win:
I found a cheap tactic on how to beat EVERY COMPUTER player in the
arena. First you need to buy the double rack of vertical launch missiles.
Then choose the abandoned highway map. When the mission starts DO
NOT move off the building. Just wait for the enemy AC to get in range
and keep pounding it with the missiles. The enemy AC's cant defend well
enough against that kind of attack. The tactic works for ALL of the arena
fighters even Ares.

Human Plus

Human Plus is back. Just drop to -50000 credits and an experiment will be done on you. you need to do this multiple times to get the full benefit. Warning, this will restart your game (except for the first mission)

1st time: Automatic Radar 2nd time: Ability to throw the laserblade 3rd time: Nothing? 4th time: Ability to walk while shooting back weapons 5th time: nothing? 6th time: Double energy. Note: to shoot the laserblade use it then immediately press the boost button. takes some practice but is completely worth it.

Hidden part:
On the snow mission where you have to destroy the crates, go in the crack to the right of the starting position and destroy part of the airplane to reveal a little cave that has an optional part for making left arm
weapons or shields power up.

First person view
While playing a game, hold Triangle + Square + Start. The
game will pause. Press Start to resume the game with the
new camera view. For the Japanese version of the game,
hold Triangle + Square + Select.

Fixed camera view
While playing a game, hold Circle + X + Start. The game will
pause. Press Start to resume the game with the camera fixed
at the pre-location. For the Japanese version of the game, hold
Circle + X + Select.

Return to default view
To return to the default view, pause the game, then press Start
to resume the game. For the Japanese version of the game, press
Select instead of Start.