Bob has been having a very bad day, ever since the Zoids found out that he was backing the trains in QuackenZoids.
As a result, he has to run for his life from various and asundry bad guys (CrockaZoids, QuackenZoids, bombs and eggs, just to name a few). His goal it to run through the the various levels while staying alive. Not an easy task, but with you on his side, quite doable.
Bob isnt entirely defenseless. He can shoot most of the baddies with electric fire balls (of his own invention). Unfortunately, they dont work against all enemies). But all is not lost. He can also run and jump to avoid problems.
Killing off a requisite number of enemies (the number is listed in the Heads Up Display at the top of the screen) will open an exit gate or display buttons that open an exit gate that Bob can use to escape the level.
To help, for every 1,000 bonus points obtained on a level, Bob gets another life to play with.
But, dont dawdle, because those exit gates are only open for a short period of time.