Bounce Trick:
Go to the menu called "other". In there, the age you enter determines how bouncy the girls are - the higher or the more "mature" your age, the bouncier they get.

Big heads:
First, beat the game with any girl. Then at the start screen, press and hold X, Circle, Square, Triangle, and Up.

Control the Victory Cam:
To Control the camera while your character is doing the victory pose, press the green triangle button. You can use the the control pad to move the camera up, down, ect. and use the square button to zoom in and the circle button to zoom out.

Full option screen:
Press start during a game and tap x and triangle at the same time.

New Extra Cars:
Take Midnight Racing Club and save your cars the load them on Smuggler`s Run and you will have extra cars!

Special Cars:
At the title screen press X 10 times, Circle, Triangle, R1, R2. You will now get all the special cars.

See the CG gallery:
Finish team mode using 5 characters.

Unlimited Lives:
At the main menu, hold R2 and press X and triangle. Then start a new game and save it. When you load the game, you`ll have unlimited lives.

Unlimited Ammo:
Go to the main menu and press Up, Down, Down, Up, Right. If done correctly, the screen will shake

Deluxe Credits:
Finish the game with every character in Very Hard Mode. This will allow you to view the deluxe version of the Credits. t`ll contain new music, credits from every Dead or Alive Development team and Website Banners from fan websites.

Expanded Credits:
Successfully complete story mode with all the characters on the very hard difficulty setting

Increased Jubbling:
Enter the options menu, and choose the game setting that allows you to set your age between 13 and 99. Increase your age to see more jubbling.

More Costumes:
even more than four costumes, just keep playing and you will get as many as 8 for some characters. I have not been able to isolate what needs to be done exactly but just keep playing and you will have a lot of cool costumes

Play as Bayman:
Successfully complete story mode with all the characters on the easy difficulty setting to unlock Bayman in all modes except story mode. Alternatively, successfully complete story mode 30 times with any combination of characters.

Play as Tengu:
Collect 10 stars in survival mode to unlock Tengu in all modes except story mode. Alternatively, successfully complete story mode 200 times with any combination of characters.

DREAMCAST CHEATS:

Alternate costumes:
Highlight any fighter at the character selection screen in any mode. You can view how may costumes your character can have to the side. If your character us in the first row, press Analog-stick Up to select the costume. For the second row, press Analog-stick Down . Some characters may have two, three, or four costumes. The costumes can be enabled in any mode .

Additional costumes:
Every character has at least 3 costumes, some as many as 6. To get the extra costumes, complete the story mode with the character (you`ll get one costume each time). This might only work on the `Very Hard` difficulty level.

Clean pause screen:
Press X + Y after pausing the game for a clear pause screen.

Control victory pose view:
When your character is doing their victory pose, hold X and press the D-pad or Analog-stick to move the camera. Hold B to zoom in at your character, then press the D-pad or Analog-stick to move the camera.

Fight in the nighttime Aerial Garden:
Enable level select for versus mode. Highlight The Aerial Garden at the level selection screen, then press Y or R.

Full pause screen:
Pause game play, then press X + Y.

Just Another Taunt:
You can also taunt by pressing Down, Down R also when Bass is fighting Tina he will taunt something else.

Hidden wallpapers:
Put the DOA2 disc into your CD-ROM drive on your computer to find wallpaper images in the Bonus directory.

Original opening:
Use the following steps to unlock the original opening sequence for the game, which features a naked clone of Kasumi. Set your age to "21" in the game options. Then, make a ranking in Survival mode in any position and enter REALDEMO as a name. Once you have saved the game with the new ranking, you can set the age to any desired value.

Play in Aeriel Garden at Night:
First enable the level select for versus mode. Now highlight Aerial Garden and press Y or R.

Secret Arena:
Finish the game on very hard level with each of the 12 characters to unlock a secret arena.

Taunt opponent:
Use the following combos to taunt your opponent.

Press Left, Right, Left, R
Press Right, Left, Right, R
Press Down(2), R
Press Back(2), R

Note: You can also substitute A + X + Y in place of R in the taunts.