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Game: NFL Gameday '97
Platform:
Cheats & Hints:

Go to the start game screen and enter L1, R1, L2, R2.
You'll be presented with an Easter Egg screen.
Enter DOC to save the codes.

Here are the codes.

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
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 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 better
GOLIATH -- Players are bigger
HANG TIME -- Punts and kickoffs stay in the air longer
HATCHET -- Forearm shiver increased
HOGS -- Offensive line blocks better
HOME COOKING -- Home team has no pass interference or personal fouls
ICE SKATES -- Less traction
IDIOT -- Computer is worse
INFAMOUS POP UPS -- Receivers pop the ball very high when hit
JUGGLER -- One handed catches are less effective
JUICE -- Speed burst is faster
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
OFFENSE -- Improve offense
OUCH -- Hurts in the air...
PANCAKE -- Wipe out defenders better
PINBALL -- Stronger forearm shiver
PISTON -- Bounce off stiff arms
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 -- Strong wind and rain
STEROIDS -- Recover specials faster and computer players are faster
STRETCH -- Jump higher on one handed catches
TEMPEST -- Dark Stadium
TIGHT COVER -- Defense covers receivers closer
TOAST -- Secondary plays farther off receivers
TORRETA -- Quarterback lobs passes
TWISTER -- Wind is very strong