NFL GameDay 2004 cheats and cheat codes for Playstation 2

Unlock stadiums:
Go to pre-season Options. Press L1 to setting up the Home Team as your 
defaut stadium. After scroll down to the stadium you want to unlock.
Enter the following codes to unlock stadium: 

Stadium - Password 
Old Carolina - CAROL  
Old Chicago - WINDY CITY  
Old Los Angeles - ANGELS  
Old Miami - ORANGES 
Old New England - SALEM  
Good Ol' Days - SEPLA TONE  
Galactic - GOVT OWNED  
Old Denver - 5280 FEET  
2050 - LIGHT YEAR 
Old Detroit - AUTOMOBILES  
Unknown - EMERALD 
Graveyard - RISING 
Space - LUNAR 
Pop Warner mode - MUNCHKINS  
LA stadium - ANGELS

Small players
Go to the main menu, hold L1 + R1 and press 
Down, Down, Up, Left, Left, Right.

Low salary:
Players might want ten million $/year, but if you create a 
player he will want about 6-8 million.

Get good players:
Create a player, then you can trade him or them for player(s) you want. 

Example: 
QB #18 Peyton Manning 94 
for QB #13 Dan Marino 94