Bob (Hidden Character)  -  To unlock Bob and the Boss Board, finish first overall on the mirror courses. 

Bucky Board  -  To earn the “Bucky Board”, complete Stunt Challenge Mode. 

Cheat Codes  -  To enable codes, access the Sound Menu and adjust the music settings as shown. Then highlight sound effects feature and push indicated buttons simultaneously.

Cheat Speech Music Sound Music Music  -  Vol. FX Test Vol.

All Players OFF 4 1 2 C-RIGHT+C-DOWN
Ant ON 1 6 1 Z+C-RIGHT
Art Boards ON 5 1 3 C-LEFT+C-UP 
Board Only OFF 7 5 2 Z+C-DOWN
BOSS Board OFF 6 3 4 C-UP 
Canada ON 4 0 7 Z+C-UP+C-LEFT
Easy Tracks ON 7 2 6 L
Ghost 1 ON 4 6 5 L+R
Ghost 2 OFF 0 8 3 R+C-UP+C-DOWN 
Ghost in Replay ON 8 8 7 L+R+C-DOWN
Grow OFF 8 7 5 Z+C-LEFT
Hard Tracks ON 5 2 4 Z
Helium OFF 0 7 1 C-LEFT+C-UP+
C-DOWN
Light OFF 5 1 6 L+C-UP+C-LEFT
Little Bob (Tiny)ON 7 7 5 L
Long Credits OFF 2 2 3 C-UP+Z
Midway Board ON 8 4 5 C-LEFT 
Midway Mode ON 2 4 3 Z+L
Mirror Tracks ON 7 6 6 L+R
Naked Dude (G) OFF 6 4 6 C-LEFT+C-RIGHT+R 
Night Mode ON 2 8 5 Z+C-UP
No Board ON 0 8 4 C-UP+C-LEFT+
C-RIGHT
Normal Tracks OFF 3 5 6 R 
Stunt Credits ON 1 3 7 C-DOWN+Z

Earn Bonus Boards  -  To earn “XXX6”, “Top Gear Rally” and “Midway” boards, finish first in all races. 

Easy Way to Get the "Top Gear Rally" Board  -  Put a custom paint job from Top Gear Rally on your memory pak and the TGR board will be opened. 

Extra Points on the Big Jump  -  To get extra points on the big jump, try doing tricks when you jump off the helicopter. It just might be enough to beat the level. 

Flower Board  -  To earn the “Flower Board”, place in all courses in the first round of Competition Mode. 

Grabs  -  Press B, R, or Z after jumping and hold the stick in any direction. Hold one button at a time to complete different grabs. 

HIdden Characters  -  To earn the hidden boarders Ben, Nieno, Tok and Boreth, rank first overall in the various stages of Competition Mode. 

Jump Start  -  Watch carefully when the race begins. Just after the word "Go" disappears, press UP twice. If done correctly you should get a jump start and be ahead of the other racers. 

More Bonus Boards and Mirror Tracks  -  You must have all levels open completely, and the best record on each track on each difficulty has to be beaten. (ex. you must beat the track records on say, polar paradise, on easy, medium, and hard). A ghost should appear on the hard setting on the track.

Beat the ghost and earn a bonus board. Then, play with that board against on the same track again. (ex. you will earn the 'Jake' board when you beat the ghost on polar paradise, so use the jake board against him) if you beat the ghost, you will earn the mirror of the the track! These are the boards you must use on the certain tracks: 

Twisty -- Twisty Canyon 
Jake -- Polar Paradise 
'55 -- Splash Down 
Tareh -- Glacier Gluch 
Typhoon -- Easy Slider 
Lynwood -- Funky Town 

More Speed  -  When you are in a race you can gain more speed by doing a stunt. The more stunts you do the faster you get in the race. Please note this code only works in racing mode. 

Moves -
Back Flip -- Up, Down, A (you can do a lot of these by holding down after you hit A.) 
Egg Flip -- Left, Right, A 
Front Flip -- Down, Up, A (you can only complete one of these in a jump) 
McTwist 720 -- Right, Down, Left, Up, A 
Misty Flip -- Right, Down, Left, A 
Rodeo Flip -- Up-Left, Down-Right, A 
Spin -- Hold left or right on the d-pad and tap A to complete a spin. The longer you hold right or left, the longer you spin. 

Shortcuts  -  Easy Slider -- Easy->hard difficulty levels 

Right after the first pinwheel, turn a sharp left and find a shortcut and a jump. Keep going until you get to the train overpass. Jump the bump behind the truck that is off to the left for another shortcut and jump Twisty Canyon----Easy->normal difficulty levels 

Go to the right whenever there is a fork in the road  -  After the 2nd fork in the road, go until the roads merge. You will get to a big jump. At the bottom of it there is a blue fence. Jump it. 

Polar Paradise -- easy->normal 
Go until you see a little bump coming out from the right side (it has two little jump arrows on it). Just at the bottom, to the right are a set of arrows telling you to go left. Go right up next to the arrows. There is a jump right after (no little jump signs though). you will see two trees at the bottom. Go between them. After a few seconds you will see a tree that you can grind. Grind it. You will land back on the path.  Keep going until you see a jump surrounded by an arched rock. Use it. Follow the left wall until you see 2 trees. Go between them and jump the fence. Go slightly right and you will land on a rock (this takes lots of practice). At the bottom you with land on the normal path. 

Polar Paradise -- hard 
When you start, go down the path and keep going until the first ledge. Pull a hard left and jump. You'll go through a secret path. Keep going down the secret path, then at the jump were the house is (it's behind the lining) after you go off the ledge go the direction it is at th let, there should be a little tunnel go done it and you'll go out a jump sending you down the track. CAUTION: On secret 2 when you go off the jump you might hit the ledge. 

Funky Town----normal->hard difficulty levels 
Go until you get to the bridge. DON'T jump the hole, go down through it. Follow the mining tunnels and you are home free. 

Tiny (Hidden Character)  -  To unlock Tiny, medal in all difficulty levels of Competition Mode. 
“G” (Hidden Character)  -  To unlock “G”, rank first overall in Stunt Mode with at least 28,000 points.