Soul Calibur Cheats (Dreamcast)

At the character selection screen, press Y to alternate all characters costumes. Press Y
again to change all characters costumes back to their original.

Highlight Sophitia and continuously press one of the following buttons or combinations at
the character selection screen until she performs her pre-battle pose: 

  X
  Y
  B
  X + B
  X + Y
  Y + B
  X + Y + B

Successfully complete the game with all standard and bonus characters.

Successfully complete the game, including the bonus stages, with every character.

Successfully complete all the missions to unlock the hidden art in the museum and a third
costume for Sophitia, Voldo, Siegfried, Maxi, and Xianghua by pressing Y + A while
selecting one of those characters. Completing all mission battles will unlock various
museum options such as exhibition theater, opening direction (change the introduction),
and character profiles. Additionally, an "Extra Survival" mode will also be unlocked at
the main screen.

Finish the game with Lizardman and you win a new mission called "Water vein".

Unlock Edge Master. Then at the character selection screen, hold R while selecting a
character.

Unlock Edge Master and successfully complete all mission battles. Then at the character
selection screen, hold L while selecting a character for extra weapons.

Successfully complete the game with each of the standard characters to unlock a new
character or stage

Win a match, then press X, Y, or B during the replay to select one of the victory poses.