Madden NFL 2004 Cheat Codes for Gamecube

Unlock Madden Cards in Mini-Camp
Get Gold in Mini-Camp challenges to unlock Madden Cards. Cards directly relate to the challenges you complete. For instance, getting a Gold in the Ground Attack challenge will yield a Priest Holmes Card. Be sure to get Golds on all of the difficulty levels to collect all of the cards!

Avoid The Cap
The salary cap is pretty easy to manipulate. If you don't like a player for whatever reason, than re-negotiate his contract so that he doesn't get a signing bonus. Than work out a trade with another team and you won't take a hit against the salary cap for trading him.

Change Song
To change a song at the main menu (or any where exept in gameplay or in a match) Press the Y button. Hold down the Y button. The help screen will pop-up. Then keep the Y button down and press the L or R button. R goes to the next track. L goes to the previous track.

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 include:
Level 2: #204 Bingo! Cheat
Level 4: #246 1990 Eagles Classic Team
Level 6: #186 Steve Spurrier Coach

Play Football 101 to Earn Easy Tokens
One place to garner quick Tokens is Football 101. Run through all of the plays in your playbook to get a substantial helping of Tokens, which you can use to purchase Madden Cards.

Unlock Cheerleader/Pump Up Crowd Madden Cards
To unlock the Cheerleader/Pump Up Crowd Madden Cards, beat the Game Situation in Mini-Camp. The team who you complete the challenge with is the Cheerleader/Pump Up Card you will unlock.