F-Zero X

Unlock all ships, tracks and difficulty modes:
Hit L, Z, R, C-Up, C-Down, C-Left, C-Right, Start at the mode
selection screen. If the code is accepted you should hear a sound.

Big racers:
Hold L + R + Z + C-Up + C-Down + C-Left + C-Right at the
ship selection screen.

Tiny racers:
Hold L + R + C-Up + C-Down + C-Left + C-Right at the ship
selection screen.

Unlock Joker Cup tracks:
Play on Stadard mode and win the Queen, King and Jack Cup tracks

Unlock X-Cup tracks:
Play on expert mode and win the Queen, King, Jack and Joker Cup tracks

Unlock Master mode:
Win the Queen, King, Jack and Joker Cup tracks on all 3
difficulty settings.

Change the title screen to comic book-style:
Finish the game in expert mode

Unlock another title screen:
Beat the game on the master mode

Change colors:
Choose a ship on the statistic screen and hit Z or R.