Bonus Teams  -  At the Options screen hold L and press C-Right, C-Left, C-Left, C-Right, C-Left, C-Left, C-Right, C-Left, C-Left. If you did the code correctly a '1' should appear on the 10th spot from the left. This will give you the extra teams: Williams, Canada, USA, and Northeast. 

Choose Your Opponent  -  To choose your opponent, highlight the team you wish to play against, then press C-Right three times. If you did it right, you'll hear a click. 

Debug Mode  -  At the Options screen press C-Down + R, C-Left + R or C-Up + R. A screen will appear where you can modify a 16-bit register. You can only alter the first 6 bits, but that's enough to change the game's appearance.

To alter the bits, use these controls: 

C-Down + R: change head size
C-Left + R: change body size
C-Up + R: change height

Here are a few examples:

100000: Stocky Players. 
010000: Stocky Players, Big Heads. 
110000: Stocky Players, Small Heads. 
001000: Small Players, Small Announcer. 
000100: Large Players, Large Announcer. 
000010: Crunched Players, Small Announcer. 
000001: Elongated Players, Large Announcer. 
110110: Large Players, Small Heads, Large Announcer 
010010: Crunched Players, Large Heads, Small Announcer 
010101: Large Players, Large Heads, Large Announcer 
010001: Elongated Players, Large Heads, Large Announcer 

Famous Female Players  -  At the trade player screen during a season press and hold A then simultaneously press b, left, right, up, down, c-down, c-right then c-left. If you did it right then you should here a slapshot noise. Then go to Mike Madano on the Stars, and he should be a woman. You can pick from 5 different women: Hillary Clinton, Pamela Anderson, Rosie O'Donnel, Neve Cambell, and Jenny McCarthy. 

Forfeit Game  -  To forfeit a game, press pause and enter the OPTIONS screen. Hold L and press C-Left nine times. Resume play and you will lose 1 - 0. 

Invisible Players  -  During the opening face off, pause the game and select Replay. Make a player flash by pressing L or R, and while he's still flashing, press the Z trigger button to make the player invisible. You can repeat this trick until the entire team has vanished! 

Move the Screen  -  Hold L+R and rotate the joystick on any screen except during the game to shift that screen up, down, left and right. Why? Who knows. Have fun! 

Non-stop Fighting  -  At the Options screen, hold L and press C-Right, C-Left, C-Left, C-Right, C-Down, C-Up, C-Up, C-Down, C-Left, C-Right, C-Right, C-Left, C-Right, C-Left. If you did this right you should get into a fight every 5 to 20 seconds!
Note: This code must be re-entered each period. 

Sure-fire Goal  -  For a goal every time, skate between the two face-off circles, then perform a Flaming Net shot by pressing Shoot and Turbo simultaneously. 

Trade Players  -  At the Options screen hold L and press C-Down, C-Down, C-Up, C-Up, C-Down, C-Down, C-Right, C-Right, C-Down. Return to the main menu, choose Records and enter the Team Stats screen. When it appears, press C-Up 10 times. To trade players, highlight a team and press A, then select a second team and press A again. Press Start to enter the Trade screen. 

Two-Player Practice Mode  -  You need two or more controllers to do this one. When you get to the main menu, move the joystick onto Practice mode and press the A button on one controller. Then at the same time, hold the A button on another controller. It will let two-players in the practice mode. 

View Credits  -  At the title screen press A 20 times. If you did it right a list of credits and pictures of the developers will appear. 

View Sponsors  -  Press Z while in the Options, Setup, or Audio menus to view all of the game's sponsors.