Constant fights: 
Hold L and press C-Right, C-Left(2), C-Right, C-Down, C-Up(2), 
C-Down, C-Left, C-Right(2), C-Left, C-Right, C-Left at the options 
screen. A fight will break out at regular intervals during the current 
period. 

Extra teams: 
Hold L and press [C-Right, C-Left(2)] three times at the options 
screen. The Minnesota, Quebec, Winnipeg and Hartford teams will 
now be accessible. 

Invisible players: 
Pause the game during the opening face off and select the replay 
option. Press L or R to cause a player to flash. Press Z while the player 
is flashing to make him invisible. The entire team can be modified in 
this manner. 

View company sponsors: 
Press Z in the options, setup, or audio menus. An advertisement will 
scroll across the lower part of the screen. A different ad appears each 
time Z is pressed. 

Change player appearance: 
Press C-Down + R, C-Left + R or C-Up + R at the options screen. 
Modify the first six bits of a 16-bit register to change the game be 
pressing: 

     C-Down + R (head size, alters bits 1 and 2) 
     C-Left + R (body size, alters bits 3 and 4) 
     C-Up + R (height, alters bits 5 and 6) 

Register Effect

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