Carmageddon

Type these in during game play.

BIGBOTTOM	Bodywork Trashed
BOYSFROMTHEBUSH	Grip-0-matic tires
BUYOURNEXTGAME	Jelly Suspension
CHICKENFODDER	Bouncy
FUNNYJAM	Turbo Peds
GIVEMELARD	Loads of money
GOOGLEPLEX	Underwater Ability
HAMSTERSEX	Blind Pedestrians
IGLOOFUN	Hot Rod
IHAVESOMESPAM	Lunar Gravity
ILOVENOBBY	Peds Shown on Map
INTHELOFT	Drugs
ISLANDRULES	Vesuvian Corpses
MOOSEONTHELOOSE	Pinball Mode
NAUGHTYTORTY	Pedestrians Respawn
RABBITDREAMER	Gravity from Jupiter
RUSSFORMARIO	Pedestrian Electro-Bastard Ray
SMALLUDDERS	Giant Peds
SPAMFOREST	Instant Handbrake
SPAMFRITTER	Free Repairs
SPAMSPAMSPAMSPAM	Peds Glued to Ground
SUPERHOOPS	Explosive Peds
TRAMSARESUPER	Pedestrian Harvest

You have to type the cheats in slowly or the game won't register them and they won't work.

All Tracks and Cars (U.S. version):
At main menu (where you can choose track or cars), enter KEVWOZEAR. You will hear a clang to verify that it worked, though it may take a few tries.

Hit L in game for a coordinate and a mile-counter display.

Holding down Z at the start line before the count down ends to pull away early. But you lose 1000 credits which you can make up for by killing the marshal. (the "Z" key can also be used for a wheel spin)...