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Gamecube - Madden NFL 2004 cheats

Earn Madden Cards With EA Bio 
Gain levels in your EA Bio by completing specific challenges and 
playing other EA Sports title to unlock Madden Cards. 

Unlockable Cards:
Level 2: #204 Bingo! Cheat 
Level 4: #246 1990 Eagles Classic Team 
Level 6: #186 Steve Spurrier Coach 
Level 3: Ray Lewis:
Level 9: Preist Holmes
Level 19: Super Bowl 38 stadium

Change music
Hold X and press L or R.

Touchdown celebration
Hold A to spike the ball, after you scored a touchdown.

Unlock Cheerleader and Pump Up Crowd Cards
Finish the "Game Situation" challenges in mini-camp mode.

Unlock Madden Cards and game cheats:
Reach a gold rating in any event on the All Pro, Pro and Rookie 
difficulty modes in mini-camp mode.

Score touchdowns easily:
Call the play HB Screen, after press Playmaker and push Triangle + Circle.