Zombies should not have the mental faculties required to use fire arms...if they can coordinate themselves to raise, aim and fire a weapon then what makes them frikken zombies?!
The CEO and founder of XGen Studios recently passed away which made me revisit all these old classics and relive that fun I had back when Flash games were just that, and not the bloated cash cows they've become now.
RIP Skye Boyes
If you're having trouble on a level, rather than cheating and being told the answer without having to think, try working backwards from end to start and figuring out what needs to happen to get the effect you want.
The first level I failed was Cahpter 3: Factory after successfully killing every enemy as soon as they were in LoS one just happened to finish their turn on the point. I'm not even going to complete the last 3 levels after that, what a horrid game.