Dead or Alive 2 Cheat Codes for Dreamcast

Unlock Tengu
Accumulate 6 hours of gameplay and he'll be avaliable

Unlock Bayman
Beat Story mode with every character

Real intro to the game
First make sure your age is set above 20. Then get a high score in Survival mode (does not have to be first place). When you have to enter your name put in ''REALDEMO''. Now you have the real intro to the game