Select the "Settings" option, then choose "Secret Codes". Enter one of the 
following codes to activate the corresponding cheat function:

Result - Cheat Code
All classic teams unlocked - GOLDENGOD 
All Rams team - LACESOUT 
All Ravens team - NEVERMORE 
1972 Raiders unlocked - WILDCARD 
1977 Cowboys unlocked - PICKEDOFF 
Monster team - GORMENGHAST 
Sugar Buzz team - HYSTERIA