Beat the highest score for a continent and enter "750J" for your name on the high score table. Hold down the 'CTRL', 'LEFT ALT', 'Z', and 'T' as the credits change. Let go of the the keys to activate the cheat. Press the 'AMIGA KEY' to activate the machine guns. Enter new coefficiants for the road turns using the keypad. The initial settings are 60 and 45.