Unlock Snoop Dogg:
Collect 30 bones during game play. Note: They are marked in yellow on the map.

Bonus FMV Ending
Complete the game with all three endings.

Unlock Taurus :
In Mission 4-G7, beat the clock without damaging the vehicle. Alternately, enter AWYEAH for your license plate.

Unlock Gunslinger mode:
Successfully complete the game with each of the three endings.

Unlock Snoop lowrider hydraulics:
Press Left or Right while in the lowrider on a Dogg Patrol special mission to change the ride height.

Show hidden dog bones on map:
Enter WHUPASS for your license plate when starting a new game.

Unlock Ayame:
In Mission 3-G5, knock out all enemies in the spa. Alternately, enter KNOICHI for your license plate.

Unlock Desperado:
Finish the game with a 100% completion (all endings unlocked). Alternately, enter RECKON for your license plate.

Unlock Jeanette:
In Mission 6-G4, kill all zombies. Alternately, enter VAKLAM for your license plate.

Unlock Officer Dick:
In Mission 10-G6, complete the level without killing any hostages. Alternately, enter THUGLYF for your license plate.

Unlock Rikimaru:
In Mission 6-G2, get a stealth kill on all enemies. Alternately, enter GENIN for your license plate.

Cool Skin
Enter these codes as your license plate at the start of the game.

M1K3 - Play as commando
HAWG - Play as biker
TFAN - Play as gangster
B00B - Play as female punk
JASS - Play as donkey
TATS - Play as tatooed lady
PHAM - Play as butcher
MNKY - Play as male punk
BRUZ - Play as boxer
J1MM - Play as corpse
FATT - Play as police officer
P1MP - Play as pimp
MRFU - Play as asian
5WAT - Play as S.W.A.T.
B00Z - Play as street bum
PIMP - Play as pimp
B1G1 - Play as your boss
ROSA - Play as your partner
HARA - Play as asian worker
FUZZ - Play as Officer Johnson
HURT_M3 - Play as your partner in underwear

Drive automatically:
When you are on a mission where you need to drive on the world map, do not press any buttons. Nick will start driving like the other cars until you take over.

Flying cars:
Flip a car by a bridge and it will fly into the air and give you a score for highest air, etc.