Stunt Arena at Turbine Sands

Complete mission #3 in adventure mode. Go to main menu. 1 player. Joyride. My favorite car is Jaded. Turbine Sands. Any weapon u want. when u start turn right. go straight until you see an entrance. BAM! that's the stunt arena

Unlimited horse power and perfect handling

Beat the first ten races with a rank of third or higher. Once finished with this task you will need to start a new game and once u have completed the first five races
new game. this time come in last each time ten times and reset the Playstation and when you look in your garage u will have a Shelby gt-350 that can go 300 and hit a turn no problem at top speed

Flying

Select Jet Boosters and Hyper Mite and then go to Turbine Sands in joy ride mode. Then find the freestyle course, go off the metal ramp while jet boosting, and then use jet boosters while in the air and you will be flying!!

Unlock HW Prototype 12

To unlock HW prototype you must complete all the missions in adventure mode.

Easiest way to beat the last mission

If you have unlocked it, use the Surfin' School Bus with the Energy Shield gadget. When you start, you have to go through a mine field. Keep using your energy shield. When you meet Rupert, you must disable him. Use your Energy Shield until you get a gadget that you can attack with. Disable Rupert and his henchmen if they get in your way. Then, you have to go destroy the computer with the special gun. Find the special gun and destroy the computer. Otto will appear and drive off. You must chase him. There will be more mines, so use your energy shield again. When you catch him, disable him with your special gun because it will take him out with two or three hits