Simpson's Road Rage
Drive red soapbox car:
At the options menu hold L + R and press B, B, Y, X.

Drive as Smithers in Mr. Burn's car:
At the options menu hold L + R and press B, B, Y, Y.

Drive Nuclear Bus:
At the options menu hold L + R and press B, B, Y, A.

Extra money:
At the options menu hold L + R and press Y four times.

More camera views:
At the options menu hold L + R and press B four times.

Overhead view:
At the options menu hold L + R and press X, X, X, Y.

Nighttime:
At the options menu hold L + R and press A four times.

2D characters:
At the options menu hold L + R and press X four times. All the people (except the character you chose) will be 2D.

Show collision lines:
At the options menu hold L + R and press B, B, A, A.

Halloween costume:
At the options menu hold L + R and press B, B, X, A. Or, set the system date to 31st October to unlock Bart in a Frankenstein costume.

New Year's Day costume:
At the options menu hold L + R and press B, B, X, Y. Or, set the system date to 1st January to unlock Barney in a tuxedo.

Thanksgiving costume:
At the options menu hold L + R and press B, B, X, X. Or, set the system date to the third Thursday in November to unlock Marge with white hair

Christmas costume:
At the options menu hold L + R and press B, B, X, B. Or, set the system date to 25th December to unlock Apu in a Santa costume.
 
Horizontal split screen:
At the options menu hold L + R and press Y four times. The screen will be split horizontally instead of vertically in two player mode.
 
No map display:
At the options menu hold L + R and press Y, B, B, X.

Special car moves:
At the options menu hold L1 + R1 and press A, B, B, A. Hold Gas + Brake + Handbrake while steering in mid-air to execute the Road Rage Roll. Hold Gas + Handbrake while stationary, then release Handbrake to execute the Speed Boost.
 
Time trial mode:
At the options menu hold L + R and press X, B, Y, A. There are no passengers, pedestrians, or traffic in this mode. Press Horn to start, stop, and reset the timer.
 
Slow motion:
At the options menu hold L + R and press A, X, B, Y.

Disable all active codes:
At the options menu hold L + R and press Start four times.

Car built for Homer:
Complete all ten levels in mission mode to unlock the car built for Homer
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