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."

If you found yourself on Google’s homepage yesterday, you would have noticed that there was a fun little card game in which you match cute cards and learn about the lunar cycle. This is the name for how the Moon's appearance changes over a month,