Cheat mode:
Press L1 + L2 + R1+ R2 at the main menu. Enter the "Easter Eggs" selection on the options screen:

Result - Password:

Players have one short - eg AHAB
More accurate passes - AIR_ATTACK
L2 + X for super shoulder charge - BETTIS
Stronger kicker legs - BIG_FOOT
Less penalties - BLIND_REF
More penalties - BUSY_REF
CPU running plays only - CLOUD_OF_DUST
Flat players - COOKIE_CUTTER
Increased CPU defense - CPU_DEFENSE
Increased CPU offense - CPU_OFFENSE
View credits - CREDITS
Great catches by receivers - CRUNCH_TIME
Smart CPU - DEEP_GRAY
Identical teams - EQUAL_TEAMS
Faster players - FIRE_DRILL
All players - FLAT_LAND
Small players - FLEA_CIRCUS
Increased difficulty - GD_CHALLENGE
Better catches - GLOVES
Juiced forearm shiver - HATCHET
No heads - HORSEMEN
Large players - HUMONGOUS
Shadow players - INVISIBLE
Better stiff arm - JACK_HAMMER
Very fast players - JUICE
Better DB coverage - LEECH
No hands - LOOK_MA
Loud announcer - LOUD_MOUTH
All McMahon team - MCMAHON
Juiced swim move - NYSE
CPU knows which play was selected - PSYCHIC
Less crowd noise - QUIET_CROWD
Defense jump higher - REJECTION
Dive then jump to roll and run - SHOW_OFF
High kicks - THIN_AIR
Easier to burn a DB - TOAST
CPU runs fake field goals and punts - TRICKY_CUP
Warped flat players - VIRTUAL_POLYGONS
Better one-handed catches - STRETCH
Stupid CPU - WATERY_AI