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Dreamcast - NHL 2K cheats

Unlock Big head mode
Hold L + R and press B, A, B, Y on controller D at the black box logo.

Unlock Programmer team
Hold L + R and press B, B, X on controller D at the black box logo.

Players pictures:
Create a player and enter the following names to see players pictures
in the "Edit Lines" menu.

Dale Hunter picture: Enter "Dale Hunter"
Marty Reasoner picture: Enter "Marty Reasoner"
Ron Hextall picture: Enter "Ron Hextall"
Tony Twist picture: Enter "Tony Twist"
Wayne Gretzky message: Enter "Wayne Gretzky"

Programmer pictures: Enter names from the development team. 
The names are listed in the manual. 

Other player pictures: Enter any person that retired during 
the 1998-1999 season