First person view:
Hold Triangle + Square + Start. Release all buttons, then press Start again.

Fixed camera view:
Press Circle + X + Start during game play. The game will pause. Press Start to resume game play with the camera fixed at the pre-location. Note press Circle + X + Select in the Japanese version of the game.

Continue from Armored Core: Project Phantasma:
Insert a memory card with a saved game from Armored Core: Project Phantasma and the file should appear yellow at the loading screen. Load that file to start with the same parts and money that you were obtained in that game.

Extra Ex Arenas:
In the Ex Arena selection screen, you will see four sets of question marks if you go down. These will be unlocked after you complete a certain requirement.

FROMSOFTWARE is unlocked after you complete all leg-specific arenas. It features a series of ACs made by From Software employees.

Guest and Champion are unlocked after you complete all of the missions (do not forget to save when prompted). Guest is an arena that contains Japanese magazine publisher's AC creations. Champion is a series of ACs made by finalists from a Armored Core: Project Phantasma Tourney held in Japan last year.

Master is an arena that has extremely dangerous ACs. It is unlocked when you get 100% in the overall under System.

Please note that these ACs are not easy to defeat. They will always have an advantage over your AC regardless of how well armed, armored, or fast you are.

Sword Wave:
Note: Plus or Reble is required for this trick. Have a lightsword equipped, then press X, Circle while the sword is still out. If done correctly, this will fire a very powerful crescent beam that can do over 2800 AP worth of damage with the Moonlight.

Cavern Invasion level:
There is a hole in the ceiling at the top of the first room. Fly up to it and take a left. There will be a very large room with guns mounted in the ceilings. Do not shoot at the guns. Instead, go directly for the left corner in the back, where an item will appear on the ground. This is the shoulder mounted disc shooter.

Destroy Berserk MTs level:
Get past the first locked gate and find the door on the left side that follows it. Follow the corridor until you find a room full of gray crates. Do not shoot the crates or you will blow up the item. Maneuver around the crates until you find a corner with a head part on the ground.

Find a FCS part:
In the level that you help your MTs there are three yellow ones and six gray enemy ones. There is a building in one of the corners with columns in the front of it. Blow it up. Enter the hole under where it was located. There will be three dead ends in there, one of which can be destroyed. Search inside to find a part of an FCS.

Find Prize Parts in the Arena/Sub-Arena:
If you have played Armored Core: Project Phantasma, you will know that you will get a free part when you defeat a certain ranking Raven. However, unlike Project Phantasma, Master Of Arena will throw more ranking Ravens at you even after you defeat all of the Ravens listed. Keep checking back in the Arena/Sub-Arena to make sure that you have fought everyone to be sure that you do not miss any prize parts.

Prizes in the Leg Specific Ex Arena:
If you go into the Ex Arena, you will see that there are four arenas that are leg specific. This means that you can not take a caterpillar (tank) style AC into the humanoid arena. The good news about these leg specific arenas is that as you conquer each one, you will get a leg part that is from the arena type you just completed (humanoid-humanoid, four leg-four leg, reverse joint-reverse joint, caterpillar-caterpillar).

Stealth unit:
Complete the Master Ex Arena to get the stealth unit (back weapon). This item will take you off the radar and is probably only meant for two players.

Enhanced Balancer Optional part:
complete the Champion Ex Arena to get the Enhanced Balancer Optional part.

New laserbalde:
To get the new laserblade, which shoots a laserblade projectile on its own, you must get PROGTECH to sponsor you in the Sub-Arena. Not only will you get this new weapon, but you will receive 50,000 credits.

New laser-powered sniper rifle:
Get PROGTECH to sponsor you in the Arena. You will receive 50,000 credits with the laser sniper rifle, which does 3800 damage (more than twice that of the Karasawa laser rifle).

Overweight override:
The overweight override is present in the game, but there is no penalty for being overweight.

Easy way to kill ACs in arena battle:
Equip your mech with the fastest humanoid legs, the new laser rifle arm weapon that shoots three beams at once, and the new back weapon shaped like a "V". Select the parking garage as your arena location. This will inhibit the flying ability of your foe and will allow you to empty all your ammo into them quickly. In the rare case that they defeat you from excessive swording or close combat, select the arena with the land mines (with trees outside). Often, they will start by damaging themselves on these mines to the extent to where you can kill them with only a few shots, or they will fly out of the area, resulting in an instant win.