NFL Fever 2003 - Platform: XBox

Classic teams
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Defeat the teams in classic challenge mode to unlock 
then in single player mode. 

Successfully complete the Running Drills in training 
camp mode to unlock the 1977 Dallas Cowboys in single 
player mode. 

Successfully complete the Passing Drills in training 
camp mode to unlock the 1996 Green Bay Packers in single 
player mode. 

Successfully complete the Kicking Drills in training 
camp mode to unlock the 1964 Cleveland Browns in single 
player mode. 

Successfully complete the Tackling Drills in training 
camp mode to unlock the 1983 Los Angeles Raiders in 
single player mode. 

Getting players in dynasty mode
-------------------------------- 
Use the following trick to get any player and create a 
player with as high a rating as you want in dynasty mode. 
First, at the main menu, go to "General Manger", and trade, 
sign, or create whomever you want. Next go to "Season", 
and on to "Dynasty". Turn off the salary cap and alter 
your depth chart. You should now have all of your favorite 
players without having to pay too much for them.