Press CTRL+ C during game play to display the console window. Then, activate the following cheats by entering the corresponding codes. Note: Activating a code will eliminate the score, making it impossible to get on the high score list:

CHEAT FUNCTION - CHEAT CODE
Unlimited smoke screen weapon - foggyweather
Unlimited health; bridge falls or high speed crashes still fatal - godisalive
No traffic1 - sundaydriver
Unlimited missiles - needrockets
Unlimited oil slick - oiltapestry
Move very fast; may glitch screen - flyingmonkey 1. Requires v1.1