At the Start Game screen, in either Pre-Season or Season Play press L1, R1, L2, R2. This will bring you to the Easter egg screen where you enter codes for the game. To delete an Easter egg, enter the code "DOC".

ASSASSIN -- Injuries up 
ATOMIC BOMB -- Explosion on hard hits 
BAZOOKA -- Quarterback has stronger arm 
BIG GIRLS -- Cheerleaders are bigger 
BIG STARS -- Better players are bigger 
BLASTERS -- More time to pop a receiver and get the ball out 
BLIND REF -- Referee misses calls 
BLIZZARD -- Lots of snow 
BO KNOWS -- Shoulder charge 
BRITTLE -- More injuries 
BROADWAY JOE -- Quarterback is slower but more accurate 
BUSY REF -- Referee calls more penalties 
BUTKAS -- Defense hits harder 
CREDITS -- View the game's credits 
CRUNCHY -- Hits are louder 
DARK NIGHT -- Darker in stadium 
DEFENSE -- Better defense 
DEMPSEY -- Field-goal range increases 
DERVISH -- Spins are more effective 
DOC -- Players don't get hurt 
ELECTRIC FB -- Players twitch 
EQUALIZER -- Most players are equal 
FLEA CIRCUS -- Players are really small 
FRIDGE -- Players are bigger 
FROG -- Players jump higher 
GB SPEED -- Play is much faster 
GD CHALLENGE -- Computer is harder 
GENIUS -- Computer is smarter 
GLOVES -- Players catch more passes 
GOLIATH -- Players are bigger and sound like monsters 
HANG TIME -- Punts and kickoffs stay in the air longer 
HATCHET -- Forearm shiver juiced 
HOGS -- Offensive line blocks better 
HOME COOKING -- Home team has no call-pass interference or personal fouls 
ICE SKATES -- Players slip around 
INFAMOUS POP UPS -- Receivers pop the ball very high when hit 
INJURIES UP -- More injuries 
INJURIES DOWN -- Fewer injuries 
JUGGLER -- One handed catches are less effective 
JUICE -- Speed burst is better 
KARATE -- Forearm shiver becomes karate chop 
KRAIG -- More fumbles 
LONG JUMP -- Players dive further 
LOUD MOUTH -- Commentator is louder 
MANDARICH -- Offensive line is at a disadvantage 
NO TIME -- Unlimited time 
NYSE -- Swim move is juiced 
OFFENSE -- Better offense 
OUCH -- If hit in the air... Ouch! 
PANCAKE -- Blockers knock over defenders more frequently 
PINBALL -- Stronger forearm shiver 
PISTON -- Jackhammer off a stiff arm 
REJECTION -- Defensive players jump higher 
SAYERS -- Opposing defensive players miss tackles 
SCRAMBLER -- Quarterback moves faster 
SHOUT -- Crowd is louder 
SLO MO -- Play is slower 
SQUALL -- More wind in rain 
STEROIDS -- Recover specials faster and computer players are faster 
STRETCH -- Jump higher on one handed catches 
TEMPEST -- Stadium turns real dark 
TIGHT COVER -- Defense covers receivers closer 
TOAST -- Secondary plays farther off receivers 
TORRETA -- Quarterback lobs passes 
TWISTER -- Wind is very strong