Dead or Alive 2 cheats and cheat codes for Dreamcast

Full pause screen                                                 
Press X + Y, while paused the gameplay.

Secret images:
If you insert your game disc into a PC CD-ROM drive, you will find 
lots of wallpaper images in the Bonus folder.

Hidden Arena:
Finish the game on very hard level with each of the 12 characters

Figh in Aeriel Garden at Night:
First enable the stage select for VS mode. Highlight Aerial Garden 
at the stage selection menu and press R or Y.

Taunts
Use the following button combinations to taunt your opponent:

Press Left, Right, Left, R
Press Right, Left, Right, R
Press Back, Back, R

Watch Ayane's Fireball movie:
Score a perfect against Kasumi.

More jubbling:
Go to game setting and modify your age between 13 and 99.
If you increase your age, you will see more jubbling. 

Nude clone of Kasumi: 
Go to game options and set your age to "21". After, reach any rank
in survival mode in any position and type "REALDEMO" as a name. 
Saved the game with your new ranking. You can set the age as you wish.