'Tis the season for all things spooky. So much, so, in fact, that even apps are getting into the spirt of things, dressing up in costume and spreading jack o' lanterns all about the place. These updates bring frightening new character skins, scary new levels, haunting music, and other tricks and treats for you to discover. If you need a starting point, these four hugely popular apps are all celebrating Halloween in their own ways. Let's see what they've got planned.