When you get a Game Over, you can continue from the Level that you
were on by waiting until the Game Over screen comes up. Then hold
Select on Controller 1, and A and B on Controller 2. Now press Start
twice on Controller 1 while holding the buttons down.
To rack up 50,000 points at the end of every round, avoid
all the enemy vehicles that get in your way. If you successfully
navigate each level without destroying a bad guy, you will
be rewarded with this bonus.