Nagano Olympic Hockey '98

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.

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.

Multi-player practice mode
Go to the title screen, hold A on controllers 2, 3, and/or 4.
Keep those buttons held and use controller 1 to highlight
"Practice" and hit A.

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