As rich, textured and involving as GTA IV's main story mode is, at some point you'll be wanting to indulge in the traditional Grand Theft Auto pursuit of gratuitous messing around. And to really get on your way in style, you'll be needing the game's cheat codes.

Guess what we've got hold of.

All you need to do in order to activate the following status boosts and spawn tricks is use Niko's mobile phone to call the related numbers. Very Matrix, no? Though 360 achievement whores please note, cheats 1 - 4 will block the 'Cleaned The Mean Streets' achievement while 5 and 15 will do the same for 'Walk Free'.

1, Health And Weapons - GTA-555-0100
2, Weapons - GUN-555-0150
3, Advanced Weapons - GUN-555-0100
4, Health - DOC-555-0100
5, Wanted Level Down - COP-555-0100
6, Wanted Level Up - COP-555-0150
7,  Climate Change - HOT-555-0100
8, Spawn Cognoscenti (Mafia Car) - CAR-555-0142

9, Spawn Sanchez (Dirt Bike) - MBK-555-0150

10, Spawn FBI Buffalo - CAR-555-0100

11, Spawn Turismo - CAR-555-0147

12, Spawn NRG900 - MBK-555-0100

13, Spawn Comet - CAR-555-0175

14, Spawn SuperGT - CAR-555-0168

15, Spawn Police Chopper - FLY-555-0100

16, Spawn Jetmax (Boat) - WET-555-0100