Nagano Olympic Hockey '98

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 (announcer's voice, alters bits 5 and 6)

Highlight the "Fighting" selection at the options screen. Then, 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. A line of numbers will appear to confirm correct code entry. A fight will break out at regular intervals during the current period.

Press Start to pause game play. Then hold L and press C-Left(9) at the options screen. Digit seven of the "Specials" number will turn to 1 to confirm correct code entry. When game play is resumed, your team will be losing 1-0 and the clock will be set to 0:00. Note: This code may have to be entered twice to function correctly.

Hold A on controllers two, three, and/or four at the title screen. While those buttons are held, use controller one to highlight "Practice" and press A.

Begin game play in arcade mode. Approach your opponent's goal at an angle with a full turbo meter. Press Shoot + Pass + Turbo to see a fire truck appear.