Unlock hidden characters: Change the system's date to one of the following January 1, October 31, November 22, 2001, December 25.

Unlock Nuclear Bus: Hold L + R and press B, B, Y, A, at the options menu.

Unlock red box car: Hold L + R and press B, B, Y, X, at the options menu.

Smithers driving in Mr. Burn's car: Hold L + R and press B, B, Y, Y, at the options menu.

View collision lines: Hold L + R and press B, B, A, A, at the options menu.

Bonus money: Hold L + R and press Y, Y, Y, Y, at the options menu.

2D characters: Hold L + R and press X, X, X, X, at the options menu.

More camera views: Hold L + R and press B, B, B, B, at the options menu.

Drive at night: Hold L + R and press A, A, A, A, at the options menu.