Type Shift-V to win the fight on the old mine road. Note that it appears to work only with the left Shift key.
Type Shift-W to finish the game.
To access the Hidden game:
When you're talking to the guy with the knife in the bar, ask him if you can try it 50 times. After that you can play the game yourself.
If you stop moving and don't touch anything for a few minutes, a screen will come up that shows a bunch of different vehicles and rotates them
Thanks to Revolution reader Reverend Harvey Wallbanger!