Play as Baiken:
You must beat the normal mode using EITHER Sol or Ky. The slight trick is to get the 2nd player to join in while you are fighting someone, beat the 2nd player, and you then get to fight your match against the computer fresh. Getting the 2nd player to join in does not count as using a continue, so you basically get as many chances to beat someone as you need. But you must watch out for being destroyed, since this will force you to use a continue.

Tip:
When playing in Arcade mode at the normal difficulty level, the first five opponents will (usually) be easily succeptible to being destroyed. This gives the player an easy way to get past the first five opponents without breaking much of a sweat.
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Play as Testament and Justice:
To fight as Testament and Justice, complete in arcade mode under the normal difficulty level. Continues may be used.

Hard mode:
Hold Down + Square + L1 + R2 and power on the PlayStation. Continue to hold the buttons until the phrase "Team Neo Blood" disappears. If you entered the code correctly, "Normal Mode" will be replaced with "Hard Mode" and "Hard" will appear above the two player/computer chaos bar


Alternate colors:
At the character selection screen, press Square, Triangle, Circle, or X.