Playstation World

Enter the following passwords:

TROLLEY         Four-wheel steering
FORKLIFT        Rear-wheel steering
HELIUMNICK      Co-driver Nicky Grist with helium
HOVERCRAFT      Race as a hovercar (back to the future 2!)
GHOSTRIDER      Less accidents
MOREOOMPH       Turbo mode
BLANCMANGE      Green jelly car
BACKSEAT           Nicky Grist driving the car
PEASOUPER         All tracks in fog
BUTTONBASH      Press X and O alternately to accelerate
DIRECTORCUT     Edit the replay of your rally
KITCAR               Fully customised Rally Edition car
OPENROADS       Unlock all tracks
SHOEBOXES        Unlock all cars (Expert only)
SILKYSMOOTH     60 FPS
SKCART               Race backwards
TINFOILED          Chrome car
NIGHTRIDER       Night racing
MOONWALK        Low gravity
DIDDYCARS        Small cars
WHITEBUNNY      Mirror Mode

UFO:
Enable the "Nightrider" cheat and then drive down previously blocked roads. A UFO will appear...