Frog storm:
Set the weather option to "Severe". Enter the "Edit Names" option of time trial mode. Enter RAINFROG as a name. A face will appear to confirm correct code entry.

Secret truck:
Enter the "Edit Names" option of time trial mode. Enter MAINLINE as a name. A face with a bandage will appear in the top right corner of the screen to confirm correct code entry. Return to the start menu, then move to the right at the truck selection screen to find the new black "Mother" truck. This truck has full speed, full traction, full suspension, and is indestructible. The Pro and Extreme difficulty levels will also be unlocked by this code. This code will remain in effect until your name is changed or the PlayStation is powered off.

Asteroids mini-game:
Enter the "Edit Names" option of time trial mode. Enter DUTCHMAN as a name. A face will appear to confirm correct code entry. Choose the "Credits" selection under the options menu to start the mini-game.