Cheat

Result

A - A - A - A

Switch to night mode.

A - B - B - A

Enable boost during play. Press Y to use boost

B - B - B - B

Add extra camera angles.

B - B - X - A

Drive Bart's Halloween car.

B - B - X - B

Drive Apu's Christmas car.

B - B - X - X

Drive Marge's Thanksgiving car.

B - B - X - Y

Drive Krusty's New Year's car.

B - B - Y - A

Drive Burns' nuke bus.

B - B - Y - X

Drive a red box.

B - B - Y - Y

Drive Burns' car as Smithers.

X - X - X - X

Switch characters to 2D.

Y - Y - Y - Y

Vertical split screen in multiplayer.