Wayne Gretzky's 3D Hockey '98 cheats and cheat codes for Nintendo 64

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Go to the setup, options or audio menus and hit Z.

Losing the game
Pause the game play then jump to the options menu. Hold L and 
hit C-Left(9 times) after resume the game.

Opponent choice
Select the opposing team and press the C-Right, C-Right, C-Right 
at the team selection screen. After choose your team, and begin 
the game.

Credits
Hold A or B before hitting Start

Score goals always:
Place the player with the puck between the face-off circles and hit 
A + C-Down.

Secret teams - Williams Entertainment, 99er, USA and Canada teams:
Hold L and hit C-Right, C-Left, C-Left, C-Right, C-Left, C-Left, 
C-Right, C-Left, C-Left at the options screen.

2-player practice mode:
Highlight practice mode and hit A on controllers 1 and 2 at 
the same time.

Fights will break out constantly:
Hold L and hit 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 at the 
options screen.

View game developers
Hit A(20 times) at the title screen.

Modify player appearance
Hit C-Down + R, C-Left + R, or C-Up + R at the options screen.
After, change the first six bits of a 16-bit register by pressing: 

C-Down + R (change head size, alters bits 1 and 2)
C-Left + R (change body size, alters bits 3 and 4)
C-Up + R   (change height, alters bits 5 and 6)
       
Register - Result:
100000 - Stocky Players                                 
010000 - Stocky Players, Big Heads
110000 - Stocky Players, Tiny Heads
001000 - Tiny Players, Tiny Announcer
000100 - Big Players, Big Announcer
000010 - Crunched Players, Tiny Announcer
000001 - Elongated Players, Big Announcer
110110 - Big Players, Tiny Heads, Big Announcer 
010010 - Crunched Players, Big Heads, Tiny Announcer 
010101 - Big Players, Big Heads, Big Announcer
010001 - Elongated Players, Big Heads, Big Announcer

Player trades
Hold L and hit C-Down, C-Down, C-Up, C-Up, C-Down, C-Down, C-Right, 
C-Right, C-Down at the options screen. After, go back to the main 
menu, choose the records option and enter the team stats screen. 
Now press C-Up(10 times). A modify teams menu will appear.
Highlight a team and hit A, highlight the another team and hit A
again. The 1st team's roster should be display on the left side 
of the screen. 
Hit B to modify the team.
Hit Down or Up to highlight the player to be replaced. 
Hit Right or Left to highlight the replacement player. 
Hit A to make the trade. 
Hit Start to jump to the next team to modify.