... at night you look through all your windows to see if there are any Zombies before letting your dog outside.
For those of you who still have that gaping hole in your soul to fill, here is the link to download the game.
The Classic version, which is browser based, is completely free to play. The newer version (Alpha), which you can download and play offline, costs like 12 USD or something. If you really enjoy the game I suggest buying it now before it goes into Beta, they plan on raising the cost when it hits Beta.