You don't need any free time, do you?

I have lost most of my day to playing Infectonator: World Edition. It's a fun game where you're goal is to infect the entire world and make them all zombies. I just unlocked Japan and zombie Col. Sanders. Truly this is a game made for someone with my sense of humor.

EDIT: OMG, if you attack New York Spiderman shows up and starts webbing zombies. If you manage to turn him into a zombie, you unlock VENOM. This is the best zombie game ever.