Off-Road Challenge - Platform: Nintendo64

4x4 Monster truck
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Press C-Up at the vehicle selection screen.

El Cajon track
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Hold Up and press the L + R at the track selection screen. 
An air wrench sound will confirm correct code entry. 
Highlight the El Paso track and press Z + A to start.

Flagstaff track
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Hold Left and press the L at the track selection screen. 
An air wrench sound will confirm correct code entry. 
Highlight the Mojave track and press Z + A to start.

Guadalupe track
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Hold Down and press R at the track selection screen. 
An air wrench sound will confirm correct code entry. 
Highlight the Vegas track and press Z + A to start.

Punisher truck
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Press C-Down at the vehicle selection screen.