Grand Theft Auto 3 - Platform: XBox

Full health:
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While playing the game, press Black(2), L, R, Left, Down, Right, Up, Left, Down, 
Right, Up. If you entered the code correctly, a message will appear. If your 
vehicle is on fire, enable the "Full health" code to extinguish it. This code 
also repairs your car. You cannot see the repairs, but it will act like a new 
car. If on a mission where you need to have a mint condition car, sometimes 
enabling the "Full health" code will fulfill the mint condition requirements.

Full armor:
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While playing the game, press Black(2), L, White, Left, Down, Right, Up, Left, 
Down, Right, Up. If you entered the code correctly, a message will appear.

All weapons:
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While playing the game, press Black(2), L, Black, Left, Down, Right, Up, Left, 
Down, Right, Up. If you entered the code correctly, a message will appear. 
Repeat this code for more ammunition.

Infinite ammunition:
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To get unlimited ammunition, enable the "All weapons" code continuously until 
whatever you want is at 9999 shots. The next time your clip runs out, it will 
reload automatically but the magazine (9999) will stay the same.

Extra money:
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While playing the game, press Black(2), L(2), Left, Down, Right, Up, Left, Down, 
Right, Up. If you entered the code correctly, a message will appear.

Lower wanted level:
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While playing the game, press Black(2), L, Black, Up, Down, Up, Down, Up, Down. 
If you entered the code correctly, a message will appear. Note: Saving the game 
will make the effects of this code permanent.

Higher wanted level:
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While playing the game, press Black(2), L, Black, Left, Right, Left, Right, 
Left. If you entered the code correctly, a message will appear. Note: Saving the 
game will make the effects of this code permanent.

Flying (Dodo) car:
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While playing the game, press Right, Black, B, R, White, Down, L, R. If you 
entered the code correctly, a message will appear. Accelerate and press Up to 
fly.