Cheats - The Simpsons: Hit & Run
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Go to the options menu, hold L and R and press:
yyxx-One-hit Kaboom (destroy vehicles in one hit)
xxxx-Make cars go faster
yyyy-Make cars go extremely fast
yaya-Infinite car health (your cars only)
xxxy-Press z to do a huge jump in a car
bbba-More camera angles
baby-Grid mode (this is really annoying!)
axxy-I think it has something to do with credits...
yybx-Displays the Speed-o-meter
bbyx-hidden cars throughout course (eg: rocket car in level 1) will appear as a little red brick car thing.
ybyb-Instead of kicking you will now trip them. (I'm not 100% sure that's what happens.)
Hope I helped