Dukes of Hazzard - Platform: Playstation 1

No Mission
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When you are at the main menu,'' go into 2 player mode when you 
are the only player and pick your car.''Then start.(You will only 
get to do Time Trials and the track called Farmers Loop) Then start 
and you will have no mission when you are playing the game. 

Rosko's Police Car
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Press Circle, Circle, X, Circle, Down, Up, Down, Down, Up

Just Ride Around
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Go to two player mode, then go to run the jug. When you take off, 
simply avoid the jug.  As long as you don't touch it you can ride 
around in the junkyard or compound as long as you please!