Get Battle Mode, Sound Test, Ghost List & Spec Functions:
Finish the game one time

Get Nightmare Mode:
Finish Battle Mode one time

Get a different Ending:
Finish Nightmare Mode

Get Chapter Select Option:
Finish the game on the Nightmare difficulty setting. A "Chapter" option will be unlocked in Story Mode

All maps:
Enter "TheWorldIsMine" as a case-sensitive code to unlock all maps.

Extra health:
Enter "GiveMeHealth" as a case-sensitive code.

Infinite Adrenaline:
Enter "VitruviAnRush" as a case-sensitive code.

Infinite ammunition:
Enter "BulletsofHell" as a case-sensitive code.

Invincibility:
Enter "CarvErVitrUvian" as a case-sensitive code. Note: This code does not work in the retail version of the game.

Run faster:
Enter "AmAFastMachine" as a case-sensitive code.

Hell level:
At the main menu, press Right(2), X, B, Left, Up, Down to unlock the Hell bonus level. If you entered the code correctly, you will hear a sound.

Unlockable Characters:
To unlock characters, complete the criteria listed:
Patty: Beat the first chapter.
Rhombus: Beat the second chapter.
Vault Dweller: Beat the game.

Completing Vicky's H.W. Level 2:
Find five stars, then make a wish. Timmy will wish for a hammer. If you are facing the boats, turn right. However, if you are not facing the boats, make a left.

Easy Money:
Due to the simplicity of the in-game economics, anybody with a decent Guile score (around 3 or so) and a half an ounce of patience will be able to buy anything in half an hour. The easiest target for this cheat is the guy in Bowerstone South right next to the entrance. Buy out all of his potions (health, will and resurection philes). The more of these items you have, the faster you make money. About 25 of each (except res. philes, you can only have 9 of them) is the best to start with. Since the price of each item is based on how many the vendor has in stock, when he has none, he'll pay a fortune and when he has a lot, he'll sell them cheap.

Cheat: Hero Save Exploit:
In the middle of a quest, if you use a hero save and reload the save, you will start at the beginning of the quest as if you had never begun, and you will retain all items that you obtained during the last run of the quest. An especially good place to use this cheat is before round 8 at the arena. This way you can play the arena multiple times and still get the experience.

Cheat: Unlimited Skill Experience Points:
In the beginning of the game, the hero is being trained at the Guild. Right after he turns into a teenager, he is to pass three tests. They are melee training, skill training, and will training. Once you pass all these tests, Maze will test you himself. First he will ask you to use melee attacks on him. Instead of doing that, take out your Yew Longbow, lock on to him, and shoot him from a distance. He takes damage but won't die. You won't be punished for your actions either. I gained 5000 Skill Experience Points in just 15 minutes!

Get a nice job:
When you get your Super License, choose Arrows Team Racing as they are the fastest team. If you keep beating your Boss' expectations, you should get offered a job at BAR or Stewart within the first half of the first season. By the middle of the second season you could be driving for McLaren.

Different Rear Views:
During a race, change view and use Rear View. There will be different rear view angles for each view.

No Driver Actions:
Go onto the 'in-car view' and look at the hands of the driver. They will change gears and do similar things. If you go to the back air intake view (after the in-car view), the driver will not move his hands at all.

Get 2001 Review Video:
Get Custom GP Championship Trophy
Get Full Championship trophy
Get Domination Trophy
Win all 17 trophies in single GP mode