Type these at the main menu:


WOOWOO --- Havoc Sirens
SUPACAM --- Enemy FallCam
BENIHILL --- Benny Hill cars
PANTALON --- All Secret missions (in Training menu)
DOOBIES --- Infinite Shields *
MRTICKY --- Infinite Weapons *
STATTOE --- In-game info


* You can't progress past the current mission when 
this code is enabled.