When you enter the options tab, there will be a thing that says Bonus Codes and it helps in the beginning for some people as it does help a little bit. When you click on the screen there will be 6 bars that are horizontally going down (each bar on top of each other) that will say locked, by clicking the top bar, you can put in the codes. You use the arrow keys (left and right) to move from one side to the other and use enter to select the number. The number appears at the bottom once selected and you go on to the next number to be selected afterward. Once you type in all the numbers that are required to unlock the specific effect, you press accept and if you put in the numbers right, a prompt box will say that you unlocked whatever numbers you put in.
Character Trousers "Speed Angel"Code : 91031985
|18041851||Unlocks Vehicle Warrior|
|18021974||Unlocks Sludgeray Butterfly livery|
|17121973||Unlocks Mudhog Lightning Bolt livery|
|48992519||Unlocks Character Helmet "Camo"|
|20061977||Unlocks Character Jacket "Road Addict"|
|91031985||Unlocks Character Trousers "Speed Angel"|