Unlimited time:
Hold Z + L + R and press C-Up, C-Right, C-Left, C-Down, C-Up, C-Right, C-Left, C-Down.

Cyclone weapons power-up:
Hold Z + L + R and press C-Left, C-Right, C-Down, C-Left, C-Right, C-Down, C-Up at the main menu. This power-up doubles the damage caused by your weapons.

Velocitar track:
Hold Z + L + R and press C-Left, C-Right, C-Up, C-Right, C-Left at the main menu.

Unlimited energy:
Hold Z + L + R and press C-Up, C-Down, C-Left, C-Right, C-Up, C-Down, C-Left, C-Right during game play.

Unlimited ammunition:
Hold Z + L + R and press C-Down(2), C-Left(2), C-Right(2), C-Up during game play.

Super-combo challenge mode:
Successfully complete all three challenge modes.

Gold Challenges:
Once all levels of a challenge are completed with a gold medal, a bonus "Gold Challenge" of the appropriate type will appear. For example, if you get first place in all six race challenges, you will be given another race challenge called the "Gold Challenge". You have to get a gold medal in this challenge, as there is no bronze or silver

All ships:
Hold Z + L + R and press C-Down(4), C-Right, C-Up, C-Left at the main menu.

Piranha II ship:
Successfully complete time challenge mode with a Bronze or better finish.