Google has launched their Halloween Doodle, aka Google logo, a day early - it is a fun game where you fight ghosts and scary critters.
You can play the game by going to Google.com.
Google described the game as:
This year's Halloween Doodle follows freshman feline Momo on her mission to rescue her school of magic. Help her cast out mischievous spirits by swiping in the shape of the symbols above the ghosts' heads. And you'd better pounce fast - the ghost that stole the master spellbook is getting away!
I assume this Doodle will be live on Google for the next two days. Bing and other search engines have yet to post their special logos and themes for Halloween.
You can learn more about the Doodle over here.
Forum discussion at Google Web Search Help.