I found the rail gun to best weapon for the last level. When you're up against that many it becomes less about killing power and more about being able to stay alive. The big guns weigh you down too much and you'll get surrounded. I found the railgun had the best mix of killing power and mobility. I also used deadly shield + long lasting to kill huge groups of zombies quickly.
Absolutely terrible. I mean, the first few steps make since, making the guy leave the apartment so you can overflow the bath tub. But then you have to send an alarm clock up a mouse hole to get the guy to stand in the right place so you can place a rubber ducky on the bathtub that for some reason makes it fall through the floor?
Meh, pretty easy. I only had to redo one level, and that was because I made a silly mistake. The last level is probably the easiest to get the last green achievement, which is get all of the clues.
I actually love this game on the iPod, but there are a few key elements missing here. On the iPod, killing a helicopter sends out debris which can be used to start a chain reaction... the best part about the game. Also, on the iPod, it takes four guys landing for you to die, but you can shoot the parachute off of a guy and if he falls on another guy on the ground it kills them both.