Dead or Alive 3 - Platform: XBox

Play as Ein
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1. First Beat the game with every character. 
2. Take Hayate through Survival or Time Attack Mode, and place. 
3. Enter your name as "Ein". 
4. You can now play him in any mode but Story. 

Unlock Ein's third costume
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Complete Time Attack in under 6 minutes. 

Unlock Kasumi's third costume
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In the Sparring Option, Perform all of Kasumi's moves under the 
"Exercise" Option. Once the game awards you the "Complete!" award, 
you'll have the costume. 

Unlock Zack's third costume
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Beat 20 people in Survival Mode 

Kasumi Hair Trick
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When picking Kasumi, press Y for her long hair, A for her pony tail.

Beat the game with each character to see each ending:
Unlock 'Real Ending' with On/Off Option. Beat the game with everyone. 
The last character you beat it with will have the staff credits 
attached to the ending. Once that's done, you can decide if you want 
the credits on or off the endings in the Game Settings Screen.


Cheats:
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from: "Haren" 

Watch clips:
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When you play as story mode after you have beaten OMEGA 
you can watch a small clip. At the main menu you can watch 
the clips of all the characters that have beaten story mode.

Alternate costumes:
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Several characters have alternate versions of the default 
costumes depending on what button you use to select them on 
the character screen: 

Kasumi: (works with cos1-3) Select with A - ponytail, 
Select with X - braided ponytail, Select with Y - hair down

Hitomi: Select with X on cos1 - same as cos1, but w/out jacket

Tina: Select with X on cos1 - green shirt, leopard pants

Leon: Select with X on cos1 - no shirt w/ bandolier

Jann Lee: Select with X on cos1 - black pants, 
Select with X on cos2 - yellow version

Christie: Select with X on cos2 - purple version

Hayate: Select with X on cos2 - green version

Hayabusa: Select with X on cos2 - white version

Brad Wong: Select with X on cos2 - red version

Bass: Select with X on cos2 - no shirt

Bayman: Select with X on cos1 - blue hat

Lei Fang: Select with Y on cos1 - white version, 
Select with X on cos1 - blue version, Select cos1 while holding L - black version

Helena: Select with X on cos2 - black version

Ayane: Select with X on cos2 - white version 

Cool move:
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With some characters (Tina and Brad Wong), if you punch your 
opponent into the air then you can execute a throw on them 
while they're falling to the ground.