If you've installed Simpsons: Tapped Out, keep an eye out for the Treehouse of Horror update, which adds zombies, a pet cemetery and new items for the period leading up to October 31.
The 51MB update, released this week, adds a raft of halloween-themed content for October.
The idea is that with Halloween around the corner, you should build the cemetery - for free, mind you - so that the dead bodies have some-place to go.
Of course, the cemetery immediately starts sprouting Zombies (a passel of ten of them every 20 hours or so, to be precise), and as Lisa says, zombies need to be killed, and "the best method is squishing them with an enormous sky-finger"
That's your cue to get to work.
When you squish the zombies (it takes two or three presses and they explode into skull and blood) you score candy, eggs, toilet paper and mysterious Mayan artefacts.
The candy can be used to buy halloween-specific limited time items from the building and decorations stores, such as the Pet Cemetery. A number of other items are also available only for a limited time, but are bought with the usual game currency of donuts or money: you can get jack-o-lanterns, spooky trees , mausoleums and the like.
The toilet paper and eggs are for vandalising your neighbour's houses.
The mysterious Mayan artefacts make a Mayan calendar, but I'm not sure if that will mean the end of the Simpson's world. (apparently, the in-game plug for the US October 7 episode has something to do with it).
If you don't squish the zombies the moment they arise from the grave, they go roaming around town and if they catch up with Springfield residents, they turn them temporarily into Zombies. I particularly liked Zombie-Flanders. Don't worry, pressing the zombie-afflicted character will relieve their symptoms.
Similarly amusing is the abbility to send the Springfield kids out Trick-or-Treating. Lisa dresses as a witch, Bart as Frankenstein, and Martin as a fairy.