Fight Night Round 3 - Platform: XBox

Bonus venues:
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Win a match at one of the venues in Career mode to unlock it:

Madison Square Garden:
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The Staples Center

Box as Ko Rey Mo:
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Platform: Xbox

Defeat Ko Rey Mo in the light heavy division in Career mode to unlock him.

Boxing styles:
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Win the indicated match in ESPN Classic Fights mode with the listed boxer 
to unlock the style:

Judge Jab: Defeat Joe Frazier with Muhammad Ali.
Lethal Uppercuts: Defeat anyone with Roberto Duran.
Sinister Cross: Defeat anyone with Roy Jones Jr.
Slickster: Defeat anyone with James Toney.
Textbook: Defeat anyone with Oscar De La Hoya.
Uptight, and Hard Straights: Defeat anyone with Winky Wright.

Burger King trainer:
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Win the Burger King event in Career mode. Then at the trainer selection screen, 
press Down until the Burger King appears as a choice. He gives you Heart when you fight.

Easy wins in Career mode:
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Go to the options menu and set Illegal Blows to Off. Then, go to the fight store 
and buy the illegal head punch called Elbow Shot. During a fight, use the Elbow 
Shot to counter attack each time your opponent throws a punch. Note: Make sure 
you use the Elbow Shot as a counter attack so that you can connect cleanly and 
powerfully on you opponent's head. You will see that the Elbow Shot inflicts a 
lot of damage to your opponent, and will KO him in a short period of time, or 
TKO because you inflicted so much damage to his eyes.