The single guide at GameFAQs is unfinished, and doesn't even cover how to unlock the cop car, so I'm asking you people: How do we unlock the fifth vehicle in Zombie versus Ambulance? We've finished the game, and unlocked "Attack" mode, but do not have access to the fifth vehicle. We had over sixty mechanics we we finished, and the last upgrade we got was made available right around forty, I believe.
I believe this game was also released in Europe as "Zombie Virus," if any of you happen to live in the land of PAL.