To enter the code, simply hold down all the buttons as well as pushing the analog sticks down. You'll also need to move them in the direction shown in (). Enter the Big Head code whilst paused, and the Everything code on the main menu. You will hear a sound if done correctly:
|Pause the game, then hold L1+L2+R1+R2+R3(whilst pushed right)+L3(whilst pushed left)||Big Head (ATVs and Bikes)|
|At main menu hold L1+L2+R1+R2+R3(whilst pushed up)+L3(whilst pushed down)||Unlock Everything|
The dirtbike and quad are the two most controllable vehicles due to their ability to ride along the walls with ease.
Drive fast without boost
To make yourself go faster in any vehicle while driving (you must let your boost charge), keep tapping X. This will make any vehicle go faster and not use boost.
When on any track with big or long jumps, hold the D-pad in any direction and your vehicle should do a flip in that direction.
When you are coming up on the finish line, have your boost meter almost all the way full. When the finish line is fairly close, throw on the boost. Do not stop holding on the boost and your car will began to heat up. After the meter is all the way to the end your car will explode, launching you a good distance forward at an extremely high speed.