Battle Cars [Model SNS-4B-USA]

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.