Fall through wall. First do a wall tap on a wall then press towards the wall and he will lean and son he will fall through and the screen will turn turquoise and then you will start a little ways away from the wall you fell through.
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Play as Amish Boy:-  Successfully complete the game as Dave Mirra with all gold medals. 

Amish Boy (original mode):-  Successfully complete the game as the game as Troy McMurray, Mike Laird, Chad Kagy, Tim Mirra, Kenan Harkin, Shaun Butler, Leigh Ramsdell, Joey Garcia, Ryan Nyquist, and Dave Mirra. 

Lunch Lady:-  Successfully complete the game as Leigh Ramsdell with all gold medals. 

Slim Jim (original mode):-  Press Down(2), Left, Right, Up(2), Circle at the rider selection screen in ProQuest mode. Alternately 
successfully complete the game with any rider. Finish first at the end of the last level to unlock a bonus bike and Slim Jim. Note: The effect of this code will be disabled if a new bike is selected.

All bikes (original mode):-  Press Up, Left, Up, Down, Up, Right, Left, Right, Circle at the bike selection screen in ProQuest mode. Note: The effect of this code will be disabled if a new bike is selected. 

All styles (original mode):-  Press Left, Up, Right, Down, Left, Down, Right, Up, Left, Circle at the style selection screen in ProQuest mode to unlock all styles. Note: The effect of this code will be disabled if a new bike is selected. 

All levels (original mode):-  Press Up(2), Down(2), Left, Right, Left, Circle at the level selection screen in ProQuest mode. Note: The effect of this code will be disabled if a new bike is selected. 

Delete saved data (original mode):-  Enter the options screen, highlight the cheats box, then press X, Triangle, X, Square, Circle, Triangle, Square, L1, L2, Triangle, Square, Circle, Left, Right, Up, Down, Right, X, Circle. 

Exorcist mode (original mode):-  Successfully complete the game as Troy McMurray to unlock the exorcist option at the cheat screen. 

First person view (original mode):-  Successfully complete the game as Mike Laird to unlock the first person view option at the cheat screen. 

Bike suspension mode (original mode):-  Successfully complete the game as Chad Kagy to unlock the bike suspension option at the cheat screen. 

Silly grunts (original mode):-  Successfully complete the game as Tim Mirra to unlock the silly grunt option at the cheat screen. 

Sticky crash (original mode):-  Successfully complete the game as Kenan Harkin to unlock the sticky crash option at the cheat screen. 

Night vision (original mode):-  Successfully complete the game as Shaun Butler to unlock the night vision option at the cheat screen. 

Big crashes (original mode):-  Successfully complete the game as Leigh Ramsdell to unlock the big crash option at the cheat screen. 

Ghost rider (original mode):-  Successfully complete the game as Joey Garcia to unlock the ghost rider option at the cheat screen. 

Dave Mirra FMV sequence (original mode):-  Successfully complete the game as Dave Mirra. 

Ryan Nyquist FMV sequence (original mode):-  Successfully complete the game as Ryan Nyquist. 

Game contest FMV sequence (original mode):-  Successfully complete the game as Slim Jim. 

Development team FMV sequence (original mode):-  Successfully complete the game as Amish Boy. 

Extra points:-  Press X and bunnyhop while not on a ramp just before the timer reaches zero. Hold Up + X or Down + X to continue to get points even though time has expired. 

Stall on something and keep your balance. The points will continue to accumulate. Before the two minutes is over, jump off. An easy way to do this is to enable the "Slim Jim" code and select the bonus bike that it also unlocks. Execute a Double Peg Stall and keep balanced to keep accumulating points. 

When you do a backflip and land it, keep riding backwards. Then when you go up another ramp, do the backflip, then a couple spins and barspins. The game will award more points than on a trick when riding forward. 

Go to Woodward - Lot 8 and go to a wall. Do a Fastplant on a side wall and hold X + Left to keep scoring. Note: you can keep doing this after the buzzer. 

More tricks:-  This trick will allow you to do Triple Backflips and Triple Tailwhips. The basic way to do a Backflip is to press Down, Square. To do a Double Backflip, press Down(2), Square. To do a Triple Backflip, which requires a lot of air, press Down(3), Square.

Bail:-  When you get any air, even from a Bunnyhop, press L1 + R1 + L2 + R2 to bail off your bike. 

Secret bike limits:-  When using the secret bike in session or proquest modes, you cannot set records such as longest grind or biggest air. The only record you can set is high score.

Tricks off bike:-  Bail in air, do a trick, and hold it. For example, press Down + Square and he will do a backflip without his bike. 

Hang on for dear life:-  Hold Triangle immediately after you bail or fall off your bike. Your rider will hang on to the nearest rail, coping, or jump. Note: Once you release Triangle, your rider will let go and fall. 

Get on top of houses:-  Go by a building and jump. Press L2 + R2 + L1 + R1 and sometimes the game will reset with you on top of a building. 

Do flips in bail contest in two player mode:-  Enter a two player mode bail contest. When you bail (R1 + R2 + L1 + L2) and are high in the air, press Up or Down to do flips, or Right or Left to do spins. 

Longer grinds:-  When you reach the end of a rail or coping in the game, jump off and land in a manual. Ride the manual all the  way to the next rail and grind. This all counts as one trick because of the manual -- you can pull off some long grinds. 

Displaying special moves:-  Finish the first three hard core and the game will display the special move combination for your character. 

Dave Mirra: Signature moves:-  Press Up/Right, Right(2), Square. Press Down(3), Square. 

Troy McMurray: Signature moves:-  Press Right(2), Down, Square. Press Down, Down/Left, Left, Square. 

Leigh Ramsdell: Signature moves:-  Press Up(3), Square. Press Right, Left, Right, Square. 

Ryan Nyquist: Signature moves:-  Press Right, Up/Right, Right, Square. Press Down(2), Down/Right, Square. 

Chad Kagy: Signature moves:-  Press Up/Right, Left(2), Square. Press Up/Right, Down(2), Square. 

Mike Laird: Signature moves:-  Press Down/Right, Down/Right, Down/Right, Square. Press Down, Down/Right, Down/Right, Square. 

Shaun Butler: Signature moves:-  Press Down, Up/Right, Up/Right, Square. Press Up, Left(2), Square. 

Joey Garcia: Signature moves:-  Press Left, Down, Right, Square. Press Down/Right, Down/Right, Right, Square. 

Kenen Harkin: Signature moves:-  Press Right, Left, Down, Square. Press Right, Left, Up/Right, Square. 

Tim Mirra: Signature moves:-  Press Down, Up, Down, Square. Press Up, Down, Up, Square. 

Slim Jim Guy: Signature moves:-  Press Left, Down, Right, Square. Press Right, Up, Left, Square. 

Amish Boy: Signature moves:-  Press Left, Down, Right, Square. Press Right, Up, Left, Square. 

Special moves: 

Ryan Nyquist: Press Right(2), Up, Right, Down(3), Right
Dave Mirra: Press Right, Up, Right, Right, Down(3)
Troy McMurray: Press Down(2), Left(2), Right(2), Down 
Joey Garcia: Press Left, Down, Right
Chad Kagy: Press Up, Right, Down(2), Up, Right, Left
Kenen Harkin: Press Right, Left, Up, Right, Left, Down
Tim Mirra: Press Down, Up, Down, Up, Down, Up
Slim Jim: Press Right, Up, Left(2), Down, Right. 

Hardcore challenge tips:-  When you complete a set of hardcore challenges on a level, the game will reveal one of the following tips. 

Greenville - Vail Trails: Hold X at the base of the jump and release at the lip for big air. 
Greenville - Greenville Park: Hold the trick button longer for more points. 
Greenville - Backyard Pools: Hold the modifier longer for bigger points. 
Woodward - Woodward Trails: Try double-tapping directions to get lots of trick variations. 
Woodward - Lot 8: Alley-oop air tricks are worth more points than rotating forward. 
Woodward - Titanic: Use nose-wheelies and manuals to keep a trick set alive. 

Woodword Trails: Secret bowl:-  The secret bowl is behind the second building with the Big Woodward sign on it. To get to the bowl, go up the jump to get on the roof. When you are on the roof jump off the back and you will be at the bowl. 

Vail Trails: Hardcore challenge mode: 

Gap the train  -  Stay were you are at the beginning and wait until you see a small area in the train . You have to time it just correctly or you will smash into the train. Grind more than 180 feet on the hydro tower wires Get a lot of speed or you will not make it far enough since you have to grind at a 25 degree angle upwards. When you start off, go to the far corner of the level (after the creek gap which is to your left at the start) and follow the quarterpipes. You will need to go off them in order to get enough speed to make the grind. You will eventually turn left and go down across the creek, where there is a large dirt pile which you must launch off. In order to get onto the rail you must grind to complete the challenge. Do not bunny-hop at any time while you are on the rail because you will lose speed. You will go around a U-turn and come back down the remaining half of the rail. 

Grind the telephone wire  -  You must gap the train to get to the other side . Just follow the path and go off the jumps and you will land on a black and purple ramp, which will bounce you up into the air towards the telephone wire. You may have to do this more than once because you have to hit the correct location on the trampoline/jump. 

Gap the fence off the trailer  -  Turn right off the start into the area with the trailers that are attached to the hillside. Go up the hillside and stop. Turn your bike around to get lined up with the trailer. Go towards the trailer and launch off the ramp, which is coincidentally attached to the trailer. 

Sleepy Ditch area:-  In Sleepy Ditch, get to the ditch, but break before you end up in the ditch. Turn to your left about 90 degrees There should be a dirt hill in that direction. Go over the hill slowly and a ledge should appear. Follow it until you reach a place where you can turn to your left. Go that way until the second ramp past the big tire you ride under. You should be able to see the sky on the other side of the trees at the top of the ramp. If you find that, go off the ramp and you will drop and fall from the sky. Note: You will have to exit and start the game again, but it a good location to learn how to do tricks.