The latest Google Doodle game is surprisingly fun, while also being educational about one of the coolest things in nature: The night sky.

"Tomorrow marks the Final Quarter of November's lunar cycle, or 'Half Moon,'" the screen reads. "The Half Moon is the turning point in the lunar cycle, shifting the balance between light and dark like moves in a celestial game."

Google’s latest Doodle is a card-matching game with a lunar theme. Beyond just making matches, you can string together phases in order for big points. Add on to your opponent’s chain of phases to steal points away.