Google has tapped a "Halloween witch" for some fun with today's homepage doodle. It's an interactive one, which lets you choose different combinations of ingredients to drop into the witch's brew for a variety of different spells, which let you interact with the doodle in different ways. I wouldn't exactly call it a game, but I guess it has game-like elements, including an exercise in zombie whac-a-mole.
The following video adequately demonstrates what you'll get with the doodle.
When you click the search button, you're directed to a search for "halloween witch," which displays the following Knowledge Graph result - one of Google's Halloween "easter eggs".
Google elected to display its own eater egg image for this. Sometimes these Knowledge Graph results draw from Google Image Search. I prefer the Witches artwork by Hans Baldung displayed in the Witchcraft Wikipedia entry that Google draws some of its Knowledge Graph info from.
Witches: Wikimedia Commons