https://www.pcgamer.com/todays-google-doodle-is-a-halloween-themed-multiplayer-game/

At what point is a Google Doodle no longer a doodle? Not that I’m one to go pinning labels on everything like a particularly fastidious sales assistant, but “when it’s a fully-functional video-game”, seems like an appropriate cut-off point. I’m fairly sure you can’t doodle mathematics, although the world might admittedly be a lot more fun if you could. Imagine if Einsten's equation for mass-energy equivalence was E= picture of a cat plus a smiley-face squared.

Anyway, head over to the Google homepage today and you can play the Great Ghoul Duel, which is a team-based multiplayer game about ghosts collecting spirits. Appearing on a (presumably haunted) server with random spectres from the Internet, you and your ghostly buddies must collect more spirits than the other team before the timer runs out.