Enable the "Dolphin" player code and start an exhibition game. Wait for your player to do The Worm for a touchdown celebration and it will appear as if the dolphin is swimming.
Easy Fumble
Hit the person on the opposite team as you would when they jump in the air and 99% of the time they will fumble the ball.
Extra Character Codes
At the enter name screen Say YES to "enter name and pin for record keeping."
If you sack the other team 2 times in a row you will get infinite turbo until the ball gets picked off or the other team gets a touchdown.
Onside Kick
After scoring your extra point hold down L1 + L2 + R1 + R2 for an onside kick. Use turbo tackle to make the fumble.
Various Cheats
Use the buttons L2, R2, and X to change the icons below the helmets on the versus screen. The numbers below show how many times to press each button. After that press the D pad in the direction indicated.
Example Clear Weather code press L2, R2, R2, X, X, X, D pad Right
Cheat Press L2, R2, X
More time after plays 0-0-1 Right
No CPU assistance (requires 2 player agreement) 0-1-2 Down
See more field(requires 2 player agreement) 0-2-1 Right
Get Big feet 0-2-5 Left
Get Big shoulders 0-2-5 Right
Get Chimp mode 0-2-5 Up
Get Classic NFL Blitz ball 0-3-0 Left
Get Chrome ball 0-3-0 Left
Fast running speed 0-3-2 Left
Get Indians team 0-4-5 Left
Get Super blitzing 0-5-4 Up
Tourney mode in two team game 1-1-1 Down
Get Super field goals 1-2-3 Left
Clear weather 1-2-3 Right
Get Cowboys team 1-3-5 Left
No punting 1-4-1 Up
Extra Big Head ball carrier 1-4-5 Left
Big head for ball carrier 2-0-0 Right
Big head for team 2-0-3 Right
No first downs 2-1-0 Up
Allow stepping out of bounds 2-1-1 Left
More code entry time 2-1-2 Right
Always QB (two humans on team) 2-2-2 Left
Always receiver (two on team) 2-2-2 Right
Ground fog 2-3-2 Down
Fast passes 2-4-0 Left
Midway team 2-5-3 Right
Rollos team 2-5-4 Up
Bilders team 3-1-0 Up
Smart CPU teammates 3-1-4 Down
No target receiver highlight 3-2-1 Down
Noftle mode 3-2-5 Up
Extra offense plays 3-3-3 Down
Neo Tokyo team 3-4-4 Down
More fumbles 3-4-5 Up
Showtime mode 3-5-1 Right
No interceptions 3-5-5 Up
Crunch Mode team 4-0-3 Right
Power-up offense 4-1-2 Up
Unlimited turbo 4-1-5 Up
Power-up defense 4-2-1 Up
Brew Dawgs team 4-3-2 Down
Gsmers team 5-0-1 Up
Power-up linemen 5-2-1 Up
No random fumbles(requires 2 player agreement) 5-2-3 Down
Armageddon team 5-4-3 Right
No replays 5-5-4 Right
Snowy weather 5-5-5 Left
Rainy weather 5-5-5 Right