More fumbles
Press A, Y, B, A, Y, B at the copyright screen.

Tackles after play ends
Press B, Y, Start(4) at the copyright screen.

Bouncing Players
Press Down, Down, Start, Down, Down, Start at the copyright screen.

Black Field
Press Start, Y, Down, Start, Y, Down at the copyright screen.

Slippery Field
Press Y(8) at the copyright screen.

Strong team
Press B, Y, Down, Start(2) at the copyright screen.

Weak team
Press Start, Y, Down, Y, Start(2) at the copyright screen.

Unlock AFC or NFC preseason teams
Press Y, B, Y, B, Y, B at the copyright screen, then select the "Preseason" option.

Unlock Acclaim and Iguana Teams
Press Down, Y, Down, Down, Y, Down, at the copyright screen.

Unlock All Bonus Teams
Press X, Left, X, Left, B, A, B, Y, Down, A at the main menu.

Unlock Acclaim and Iguana Teams
Press Y, A, X, Y, Down, B, Left, Y, Up, Right at the main menu.

Unlock AFC and NFC Pro Teams
Press B, Up, Left, A, X, Right, Up, Right, Up, B at the main menu.

Unlock Jaguars and Panthers
Press Up, Down, X, Y, Left, Up, B, A, Down, Y at the main menu.

Master Code
Press Down, Start, A, Y, B, Down at the at the copyright screen.

Unlimited Turbo Runs
Press B, Y, A(2), Y, Start at the copyright screen.

Up and over dives
Press A, Y, Start, Start, Y, B at the copyright screen.

No fumbles
Press B, Y, B, Y, B, Y at the copyright screen.