Unlimited Creation Points:
Go to "Rosters" then choose "Edit Player". Select the player you want to be rated 99, go into his attributes and increase all of his stats. 

Unlock Mummies Team:
Use a Memory card that has a saved game file from an EA Sports Racing Game. 

Unlock Dodge City Stadium:
Use a Memory card that has a saved game file from an EA Sports Football Game. 

Unlock Marshals Team:
Use a Memory card that has a saved game file from an EA Sports Football Game. 

Unlock Nile High Stadium:
Use a Memory card that has a saved game file from an EA Sports Racing Game. 

Unlock Players:
Kevin Butler - Get Gold in All-Madden Coffin Corner Drill (Mini-Camp)
Mike Ditka - Use a Memory card that has a saved game from an EA Sports football game 
John Elway - Get Gold in All-Madden Pocket Presence Drill (Mini-Camp) 
Steve Largent - Use a Memory card with a saved game from an EA Sports racing game 
Barry Sanders - Get Gold in All-Madden Ground Attack Drill (Mini-Camp)
Deion Sanders - Get Gold in All-Madden Swat Ball Drill (Mini-Camp)
Mike Singletary - Get Gold in All-Madden Chase and Tackle Drill (Mini-Camp) 
Jan Stenerud - Get Gold in All-Madden Clutch Kicking Drill (Mini-Camp) 
Reggie White - Get Gold in All-Madden Trench Fight Drill (Mini-Camp) 
Steve Young - Get Gold in All-Madden Precision Passing Drill (Mini-Camp)