Go to the Options menu. Hold L1 + R1 and press triangle, triangle, square, square. You can now drive as Mr. Smithers in Mr. Burn's limo.
Get 2D Characters
At the options menu Hold R1 + L1 and press Circle, circle, circle, circle. A sound will signal correct code entry.
Get Homer Car
Finish all 10 missions in mission mode. Go to Homer's picture in the select screen to get the car.
Get Inside Mr. Burns Mansion
In Springfield Mountains, go to the cemetery. You should see another gate to your right. Go inside the gate and drive into Mr. Burn's house to trash it. Take that you transport tyrant!
Get Nighttime Mode
At the options menu, Hold L1 + R1 and press X (4). Then a sound will signal correct code entry.
Get No Map Mode
At the options menu Hold R1 + L1 and press Square, triangle, triangle, X. A sound will signal correct code entry.
Get Nuclear Bus
At the options menu Hold L1 + R1 and press Triangle, triangle, Square, Circle. A sound will signal correct code entry.
Get Overhead View
At the options menu Hold R1 + L1 Circle,circle,circle,square. A sound will signal correct code entry.
Halloween Bart
Go to options and hold L1 and R1 down and press Triangle, Triangle,Circle,X.You will hear a sound that confirms that it is correct.
Hidden Christmas character
Setting the system date to December 25th will unlock Christmas Apu under "?" at the Character selection screen.
Hidden Halloween Character
Change the system date to October 31st to unlock Halloween Bart in the character selection screen under the "?".
Hidden New Year's Character
This cheat is simple. Set the system date on your Playstation 2 to January 1st, and the New Year's Krusty will be unlocked under the "?" at the character select screen.
Hidden Thanksgiving character
Setting the system date to November 22nd will unlock the Thanksgiving Marge under "?" in the character selection screen.
Hint
On Springfield Dam their are lots of shortcuts. The first short cut is near the TNT storage and Quimbys Mansion. Head towards the TNT storage and in the cliff their are some overhanging branches and leaves. Drive right through them and you will come out at the smashed in bridge. The second shortcut is near the beginning where you start, near the stonecutters. You soon come towards a huge yellow sign. Go under the sign and there is a hill. Go up the hill and you will join the road again. You can also do this going back towards the stonecutters as well. The third shortcut is going off the side of the Dam. Go down the Dam and go along the river. On the left of the river about half way down is a dirt track going up a hill. Go up the hill and you will come out at Rancho Relaxo. Using all of these shortcuts it is easy to get over $15,000 !
More Time
Hit phone booths that have a picture of Burns to get 2 extra seconds.
Play On
After you have completed the ten missions, you will b able to play on all af them, in any order you like. Literally this game never ends.
Skip Mission
Fail a mission 5 times to skip that mission (except for the last one).
Slow Motion
Go to options and hold L1 + R1 and enter X, circle, triangle, square. A noise will confirm the correct entry.
Stop Time
At the options menu, hold R1 + L1 and press Circle, triangle, square, X. If entered the code you should here a sound signal correct code entry. Press R to start, stop, and reset the timer.
Unlock Apu in a Santa costume
Set internal system date to December 25 (Christmas Day).
Unlock Barney in a tuxedo
Set internal system date to January 1 (New Year's Day).
Unlock Bart in a Frankenstein costume
Set internal system date to October 31 (Hallowe'en).
Unlock Marge with white hair
Set internal system date to the 3rd Thursday of November (Thanksgiving).