Speed Demon:
Successfully complete the entire MX career.

Trickbot:
Successfully complete the entire Freestyle career. 

Everglades: Jump over 600 feet: 
From your starting point on the dock, back up slightly and look to your left. Ride 
over to the set of jumps that are at the other end of the barges. Once in the area, 
ride over the jumps to your left until you reach the jump that is directly left of a 
palm tree. Past this jump are two landing slopes; one that is directly in front of the 
jump next to the palm tree, and one that is behind it and to the left. Ride over to 
the second slope and face the right hand corner/side area of it. Continuously ride 
into this area, trying to push your way through it. With some speed and the proper 
placement, you should be able to ride through the corner of the slope and ''fall'' 
through the ground, eventually re-spawning back onto the dock where you started. 
During this ''fall'', you will also be able to string together as many tricks as you 
wish for an insanely huge multiplier without the fear of crashing; when you re-
spawn back onto the dock, the game still acts as if you are in the air, Note: Be 
careful with the gas and brake/reverse, as the game also acts as though you are 
on the ground as well. When you are done with your multiplier, speed off into the 
level as usual. If done correctly, when your jump distance meter appears it should 
read more than six hundred feet. Note: Repeated use of this glitch to increase 
your multipliers may cause the game to crash. Make sure to save your place 
immediately after you have achieved your new jump distance. As with any glitch, 
use it at your own risk. 

Slipknot Movie  :
Enter: 23F7IC5 

Cheat: Super Fast Bikes :
Enter JIH345 as a cheat in the options menu. 
 
Unlockable: Police Bike :
Complete Freestyle competitions. 
 
Unlockable: Slipknot Bike :
Race as a Slipknot maggot: 86657457
(the word slipknot backwards, numerical ala phone keypad)or complete Master 
Supercross. 

Performing donuts:
While not moving, hold Square and Left or Right and press the gas (X). To make 
faster rotations, hold the clutch (L2) immediately before you perform this. 

Get Squashed by your bike:
Go into the rock quarry level and go into the objective in front of you fall of your 
bike and retry the objective you will be on the ground with your bike on you.