Battle Arena Toshinden 2

Play as Uranus and Master
While the words are flying onto the Title screen, quickly press R1, L2, X, L1, R2, Circle on controller two.
Play as Sho and Vermillion
While the words are flying onto the Title screen, quickly press Circle, R2, L1, X, L2, R1.
Remove the Power Bar
Pause the game during battle, and hold Circle + Square + Triangle + X, then press Select twice.
Warp to Final Boss
At the Title screen, press Up, Down, Up, Down, Up + Triangle.
play as the bosses do the following, beat the game and go to player select screen and go to the question mark, press and hold down the select button and you will notice that Master and Uranus are playable. Press triangle to play as any of them.
play all four bosses beat the game on level 4 to obtain Master and Uranus; go to "?" and hold down "select" to choose. Then change to level 5, beat the game again and now you can choose Sho and Vermillion.

Get all of the bosses unlocked without having to play thru the game on the first title screen (when the letters for Takara scroll) type in L1, L2, (Triangle), R1, R2, (Square) on Controller 1and that will Master & Uranus for Vermillion & Other Chracters type in (Square), R2, R1, (Triangle) L2, L1.

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 Battle Arena Toshinden 3

Random Character Select
At the Characeter Select screen, hold L1 + L2 + R1 + R2.
Remove display
Pause a fight. Hold Circle + Triangle + Square + X and press Select. This
removes the continue, options and reset selections. While continuing to
hold the four buttons, press Select again. This removes the Life and Over
Drive bars. To return the display to normal, repeat the code while pressing
Select once.
Play as sub-bosses
Beat the game with each basic character at level three or higher to unlock
his or her sub-boss.
Play as Shou
Unlock all the sub-bosses, then beat the game with Vermilion at level
three or higher.
Play as Abel
Beat the game with Shou at level seven.
Play as Veil
Beat the game with Abel at level seven.
Play as Naru
Beat the game with Veil at level seven.
Alternate costumes
Beat the game with Naru at level seven. Use Square or X to select
a character.
Instant secret moves
Beat the game with Naru, then set two or more of the shoulder buttons
to special moves. Press all special move buttons at once to perform a
secret move. Note that this does not work for all characters.
Unlimited Soul Bombs
Press Start to pause a match. Use the controller configuration option
to map the L1, L2, R1, and R2 keys to Soul Bombs. Resume game play
and press one of the those buttons and X simultaneously to release a
Soul Bomb. That button combination may be pressed an unlimited amount
of times during the match.
Manual camera control
Enter the button configuration menu, highlight any shoulder button, and
press L1 + L2 + R1 + R2. The controls for the shoulder buttons will change
to camera view controls. The view may now be rotated manually.

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 Battle Stations

Level Skip
While playing, hold L1 + L2 + R1 + R2 + Select, then press Start + X.
To Kill a Battleship
The easiest way to kill a battleship is with a submarine. As soon
as the battle starts, DIVE! When you dive, a helicopter will come out
and use sonar to find you. You should make your way under the other
ship. While staying under him, pump out torpedoes like heres no
tomorrow. In this way he should be destroyed fairly easily.
Trash Carrier with your PT Boat
When the battle starts, let him target you and launch his planes. Then,
extend your hydrofoils and turn straight into him. His planes will miss
you (most times), and won't be able to land when he's turning away
from you. Keep turning with him as you light him up with torpedos.

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 BattleTanx: Global Assault

Level Select
Password: BCKDR
Brandon Gang
Password: SMSLGNG
Cassandra Gang
Password: NSTYGRL

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 Beast Wars: Transformers

Infinite Points
Go to a rock wall in a desert level. Shoot the rocks, and your points will go up with every shot. If shooting in one area doesn't work, shoot an edge.
Level Skip
Pause the game, hold L2, then press Up, Down, Left, Right, Triangle, X, X, Triangle, Right, Left, Down, Up. Unpause the game while still holding L2.
Super Weapons
While playing, quickly press Up, Down, Left, Right, Triangle, X, Square.
Weapon Power-Up
Pause the game, hold L2, then press Up, Down, Left, Right, Triangle, X, Square. Unpause the game while still holding L2.
Extra Characters
At the Options screen, hold L1 + L2 + R1 + R2 and press Circle, X, Triangle, Circle, Circle, X, Square.
Missile Lock
To use the Missile Lock, hold the FIRE button after shooting to lock the missile on an enemy.

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 Beat Mania

Hidden Mode 1
Hold L + R (the two back keys on the Beat Mania controller) and press Start when the menu with the "Press Start Button" selection appears. Release those buttons and press Left + X (the two white keys on the left and right side). If entered correctly, you will hear a sound.
Double Play Mode
Hold Left + Square + X (the three white keys) and press Start when the menu with the "Press Start Button" selection appears. Release those buttons and press L + R (the two black keys). If entered correctly, you will hear a sound.