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Alternate costume:
Highlight a fighter at the character selection screen and push Guard.

Unlock Assassin:
First you have to finish weapon master mode once. Then in chapter 8, finish the stage CRYSTAL MINE, in both the extra and normal missions. Now you will see a path to sub-chapter 3. The second mission in sub-chapter 3 is called CASTLE OF THE DAMNED. Since you hav already finish the game once, you will have an extra mission for CASTLE OF THE DAMNED, in which your opponents are considerably quicker. You must beat the enemies, who are (in this order): Voldo, Ivy, Yoshimitsu, Taki, and Assassin. After finishing the level you will unlock Assassin. He is available in all two player modes except for arcade and extra arcade. He is also available in practice and extra practice modes. Assassin has six costumes to choose from, and some of the best combo and juggling moves in the game.

Unlock Berserker:
Finish every one of the 10 chapters, then replay sub chapter 1. This should be a dungeon where you fight lots of berserkers. Beat the Boss to unlock Berserker in every mode except weapon master mode.

Unlock Lizardman:
Finish sub-chapter 2 in weapon master mode. Lizardman will only be available in two player team battle mode, versus mode, extra versus mode, and basically any mode that involves two players. The only single player mode he is in is practice mode. Lizardman does not have a move list, but most of his grapple moves are similar to Nightmare's.

Unlock Yoshimitsu:
In weapon master mode, complete chapter 2. The last area in chapter 2 (eastern-most mission) is a dungeon area. The final "Boss" of the dungeon is Yoshimitsu. Defeating him will unlock him in all modes.

Unlock Charade:
In weapon master mode, complete chapter 2. The first mission in chapter 3 (western-most mission) will have you fighting Charade. You can only do a ring out to win this match. Defeating Charade will unlock him/her/it in all modes. Charade plays much like Edge Master/Inferno.

Unlock Cervantes:
In weapon master mode, complete chapter 3. The last area in chapter 3 (the eastern-most mission) will occur on the Pirate Ship level, and the last character fought will be Cervantes. When he is defeated, he will become playable in all modes.

Unlock Sophitia:
In weapon master mode, complete chapter 4. The final area (eastern-most) will be a dungeon, with the last Boss being Sophitia. Defeating her to unlock her in all modes.

Unlock Seung Mina:
In weapon master mode, get to chapter 6. Near the middle of the chapter, there will be a palace icon. This fight will be against Seung Mina. Defeating her will unlock her in all modes.

Martial art demonstration mode:
In weapon master mode, complete the southern-most mission of chapter 3. When complete, a road will form to the south, into a "subchapter." The shop in this area sells all of the character weapon demonstrations.

Taunt:
Select arcade mode. After you choose your character; push A or B while the stage loads to hear your character taunt the second player.

Slow motion replay with camera control:
Press R during a replay and control the camera by pressing the Left Analog-stick.

Extra arcade mode:
Finish arcade mode as any character.

Extra vs. mode:
Finish extra arcade mode as any character.

Extra survival mode:
Finish survival mode with at least ten wins.

Extra practice mode:
Finish weapon master mode as any character.

Extra vs. team battle mode:
Finish extra team battle mode:

Arcade version opening:
Play the game in extra time attack mode under the extreme difficulty setting four times.

Home version opening:
Play the game in extra survival mode with the no recovery setting four times.

Demo theater and character bios:
Finish arcade mode or extra arcade mode with any character.

Alternate introduction screen:
Finish every Weapon Master mission.

Unlock every Extra modes to unlock the third start screen.

Unlock every mode, weapon, and character to hear Sophitia say SOUL CALIBUR 2 at the PRESS START prompt.

Unlock everything (all characters, modes, artworks, costumes, weapons, etc.) to hear Voldo breathing strangely at the PRESS START prompt.

Alternate stages:
Some of the stages that can be unlocked in weapon master mode have alternates. To choose an alternate, highlight the desired stage and press Right or Left. Not all stages have alternates, and some have more than one.

Character statements:
In the versus screen, push A, B, Y, X, L, R, Z, or any direction on the C-stick for various optional character statements before the match.

Character profiles:
To unlock profiles for any character, finish arcade mode with that person.

Voice actor names:
After unlocking a character's profile in arcade or extra arcade, enter the characters' profile. When you are at his/her profile, select "Voice". Once in this new menu, push the L. A small box just above the menu will appear for a few seconds, giving the name of the actor/actress who played the voice of the character.

Sub-chapter 2:
To unlock sub-chapter 2, completely clear chapter 4, reach level 72, then replay a chapter 4 mission.

Soul Calibur weapons:
Clear all of sub-chapter 4, Mt. Procyon, to unlock extra chapter 2 (Cephues). You will now be able to buy all Soul Calibur weapons, ending arcade version costumes for Voldo,Taki, Talim, Seung Mina, Cassandra, and Sophitia. Link's Great Fairy Sword is also there.

How to regain your health:
When you are in a dungeon and do not regain full health back after a battle, just go to the first square in it and fight there. You will start at full health again.

Soul Edge Complete weapons:
To buy soul edge complete weapons, for any weapon master mode player, complete both the regular and extra missions at the Ancient Amphitheater in chapter 9. This unlocks the path to Northern Algol. Complete both missions there. The road to extra chapter 1 is unlocked after that. If you shop at this area, you will have everyone's Soul Edge (Complete) weapons to choose from. REMEMBER: This was done after completing every previous regular missions and all extra missions up to this chapter in weapon master mode.