i played through professional in 9 hours, now the levels were hard at certain points but wheres the difficulty in the bosses especially shandor destructor version and stay puft was a push over. imo the hardest part were those damn stone angels at the gate when the ecto cant get throught, i still have no idea how i beat that part just got lucky i suppose. and one more thing, when they said how bout the rookie drives the ecto-1b i got really excited then they said not, assholes lol