NFL GameDay '98 cheats and cheat codes for Playstation

Cheat Codes
Go to the options screen and select the "Easter Eggs" option.
Then, enter any of the codes bellow:

Code - Result
watery ai - Decrease CPU AI
virtual polygons - Warped flat players
tricky cup - CPU runs fake field goals and punts
toast - Easier to burn a DB
thin air - High kicks
stretch - Better one-handed catches
show off - Dive then jump to roll and run
rejection - Defense jump higher
quiet crowd - Less crowd noise
psychic - CPU knows which play was selected
nyse - Juiced swim move
mcmahon - All McMahon team
loud mouth - Loud announcer
look ma - No hands
leech - Better DB coverage
juice - Super speed bursts
jack hammer - Super stiff arm
invisible - Shadow players
humongous - Large players
horsemen - No heads
hatchet - Juiced forearm shiver
gloves - Receivers catch better
gd challenge - Increased difficulty
flea circus - Small players
flat land - Flat players
fire drill - Faster players
equal teams - Identical teams
deep gray - Smart CPU
crunch time - Great catches by receivers
credits - View credits
cpu offense - Better CPU offense
cpu defense - Better CPU defense
cookie cutter - Flat players
cloud of dust - CPU running plays only
busy ref - More penalties
blind ref - Less penalties
big foot - Stronger kicker legs
bettis - L2 + X for super shoulder charge
air attack - More accurate passes
ahab - Players have one short leg

Bonus teams
Press Up to at the team selection screen access Super Bowl teams for
player-1. Press Down at the team selection screen for player two. 
Press Up again at the player selection screen to access All-star teams 
for player-1. 
Use L1 and L2 to view more selections. 
Press Down and use R1 and R2 at this screen for player-2. 

Bonus audio
Insert NFL GameDay '98 game disc in an audio CD player 
and play track 2.