Battle Cars - Platform: Super Nintendo

Overhead view
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Press Up, Down, L, R, Select at the title screen. Enable 
the new "Mystery Mode" selection at the bottom of the 
options screen. 

Drive Boss car
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Press L, R, Up at the title screen. A rumbling sound will 
confirm correct code entry. Start a normal game. 
After reaching the Boss, you will be driving his car. 

Alternate car colors
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Highlight a car at the selection screen then press A + 
Select + Start. You will now be able to choose a color 
for your car.