F-Zero

Faster vehicles:
Press A, B, L, A(2), R, B at the title screen.

Alternate vehicles:
Press A(2), B, A, L, R, A, B, L at the title screen.

Slower opponents:
Press A, R, L, B, A(2), B, L at the title screen.

All tracks:
Press B, L, B, A, R, B(2), A(2) at the title screen.

Password screen:
Press L, R, Start, R, L, Select at the machine selection screen in Grand Prix mode.
Information in this section was contributed by Bear654.

In-game reset:
Press Select + Start + A + B during game play.
Information in this section was contributed by twj633.

Demonstration mode:
Press Select at the title screen.
Information in this section was contributed by twj633.

When you win all of the tracks or have unlocked all ten cars, more demonstration cars and modes will become available. The "Wind Walker" is quite amusing.
Information in this section was contributed by MasterCharphlosion.

Delete saved games:
Hold L + R and turn on the Game Boy Advance. Select "Yes" at the prompt to delete your game saves.
Information in this section was contributed by twj633.

Obtain ranking password:
Select "Ranking" at the main menu. Select the desired series, game, and course. Then, hold L and press Up, Right(2), B, Left, B, Right, A at the course ranking screen. The course name at the top of the screen will be replaced with a password to confirm correct code entry. This password is used by Nintendo to confirm your course rank in their contests.

Sly Joker:
Win the Pawn, Knight and Bishop tracks under the standard difficulty setting.
Information in this section was contributed by Gamelord87.

Falcon Mk.II:
Win any set of tracks under the master difficulty setting.

Fighting Comet:
Win the Pawn, Knight, Bishop and Queen tracks under the master difficulty setting.

Silence: Open C:
Complete a linked game with another Game Boy Advance using only one game cartridge.
Information in this section was contributed by mikeee001.

Silver Thunder:
Win the Queen tracks under the expert difficulty setting. Alternately, win any set of tracks under the master difficulty setting.
Information in this section was contributed by Barry Sorrell.

Stingray:
Win the Pawn, Knight and Bishop tracks under the expert difficulty setting. Alternately, win all the tracks under the expert difficulty setting.
Information in this section was contributed by Barry Sorrell.

Jet Vermilion:
Go to Nintendo Of Japan and enter your name exactly, and press "Confirm". You should get a password which will allow you to get the top secret car Jet Vermilion. Enter that password in your game to unlock the car.
Information in this section was contributed by Bear654.

At the name entry screen, select "Entry". Then enter T&T as a name. Start a game under that name. When you reach the machine selection screen in Grand Prix mode, enable the "Password screen" code and enter V-J4+6V9A-30 as a password.
Information in this section was contributed by RyansHope.

At the name entry screen, select "Entry". Then enter YAZZO JR. as a name (including the space). Start a game under that name. When you reach the machine selection screen in Grand Prix mode, enable the "Password screen" code and enter 2-8+o8T2YQ30 as a password.
Information in this section was contributed by Kyle Geishecker.

Alternately, enter H-M2XLT8A-30 or 3-KLY9V8?-30 as a password. Then, press Up at the vehicle selection screen.

You can unlock Jet Vermilion normally by using one of two methods. One is to unlock all other cars and completing championship mode 255 times. The other to complete every series on Master Class with all other racers.
Information in this section was contributed by Nick Heinecke.

Master difficulty setting:
Win the Pawn, Knight, or Bishop series under expert difficulty level in grand prix mode to unlock the master difficulty for that series.

Queen circuit:
Win the Pawn, Knight, and Bishop circuits under the expert difficulty setting.
Information in this section was contributed by TrunksAJ55.

Hint: Bishop Series: Cloud Carpet: Icarus Circuit: Shortcut:
When you get off the bank of ice/snow, use a boost from the previous lap and go straight. You will save time and avoid damage to your car on that sharp turn.
Information in this section was contributed by MasterCharphlosion.

Hint: Knight Series: Ancient Mesa: Split Circuit: Shortcut:
Once you reach the second bank of ice/snow before the jump, use the boost you have gained on the previous lap and make the sharpest left you can. You will land on the other side of the track before the finish line. This saves time and avoids crashes on that sharp turn.
Information in this section was contributed by MasterCharphlosion.

Hint: Knight Series: Stark Farm: Third Circuit: Shortcut:
When you reach the fork in the road, take the right. When you reach the jump, do not jump across. Instead, take a right while you are in the air to land on the other road. You will save damage to your car from not continuing the jump.
Information in this section was contributed by MasterCharphlosion.

Hint: Queen Series: Tenth Zone East: Plummet Circuit: Shortcut:
Before you get to the fork jump, use a boost from the previous lap. Do not immediately go over the sparkly ground. Instead, stay slightly to the side of the sparkly ground to go farther than usual.
Information in this section was contributed by MasterCharphlosion.

Make sure you have a boost. Use the boost before the first jump. On the second jump, make a sharp left. If you land on the road and have enough boost, you can make a sharp right and land on the S-curve road.
Information in this section was contributed by Piccolo60000.

Hint: Pawn Series: Cloud Carpet: Long Jump Circuit: Shortcut:
When you reach the jumping area, hit the left boost and do not jump straight across. Make a left as soon as you jump and you should see some land. Land on it and you will not have to make the long sharp turn that people often crash in.
Information in this section was contributed by MasterCharphlosion.

Once you get to the jump, make sure you hit the boost and make a sharp left. If you watch the screen, you can see where to land.
Information in this section was contributed by Piccolo60000.

Hint: Bianca City Stretch Circuit: Shortcut:
On any lap except for the first, use a boost (press L + R) after the first turn. You will see a blue stripe. Hit the blue stripe and you will jump. Then, turn right and aim for the road on the far side of the land. As you land on the road, press Down. This will save you from taking the corner and allow you to overtake some other racers. Be careful; if you turn a sharp right you will land off road and explode.
Information in this section was contributed by Cool21.

Hint: Turn sharply:
Press A repeatedly while turning to turn without hitting the forcefield.
Information in this section was contributed by Kikyoubutt.