Code menu:
Highlight "Option" at the main menu and press L1, R1, L2, R2 to access the code menu. Enter one of the following case-sensitive codes. Note: "_" indicates a space.

Result - Code:

Better spin move - Tasmanian
Better stiff arm - Super_Stiff
Black colored visiting players - Dark_Horse
Cheerleaders are bigger - Amazons
Clock runs faster - Fast_Clock
Clock runs slower - Slow_Clock
Computer is slower - Slow_CPU
Copper colored players - Copper
Coverage is better - Tight_Cover
Coverage is worse - Loose_Cover
Dark stadium (only night games) - Lights_Out
Difficult one player game - Angry_CPU
Easier to knock ball out of Wide Receiver's hand - Jack_T
Easier to swim around someone - Swim_Up
Extremely difficult one player game - Cruel_CPU
GameBreakers are bigger than regular players - Big_GB
GameBreakers are smaller than regular players - Tiny_GB
Gold colored visiting players - Gold
Hang time is increased on kicks - Helium
Harder hits - Rock_Em
Harder to swim around someone - Swim_Down
Increase the number of injuries - Injuries_Up
Jumping receiver flips more - Circus_Flip
Kicker has a weaker leg - Little_Foot
Kicker has stronger leg - Big_Foot
Kicker has strongest leg possible - Thunder_Foot
More fumbles occur - Fumbles
More interceptions occur - Interceptions
No fouls on home team - Politics
Offense blocks are better - Blocking_Up
Offense blocks are worse - Blocking_Down
Platinum colored players - Platinum
Players are bigger - Giants
Players are never hurt - Healthy
Players are smaller - Midgets
Players cut quicker - Jukes
Players dive farther - Long_Dives
Players run faster - Flash
Quarterback has a stronger arm - Big_Arm
Quarterback has a weaker arm - Little_Arm
Quarterback has best arm possible - Cannon
Rains harder - Hurricane
Referees are bigger - Big_Ref
Referees are smaller - Tiny_Ref
Show credits - Credits
Silver colored visiting players - Silver
Snows harder (Snow option must be on) - Blizzard
Tackling is better - Tackles
Unknown - Strap_It_Up
Unknown - Hammer
When you win you actually lose - Dark_Storm
White colored visiting players - White_Knights
Wide Receiver will catch more and drop less - Hands
Wind blows harder (Wind option must be on) - Tornado