February 18, 2016 2:28 PM EST

If you have kids or a younger brother or sister, you’ve probably seen them playing a game called Minecraft. On first glance, Minecraft looks a lot like digital LEGOs — but there’s much more going on here. Microsoft is now spending big money to get teachers to use the game as an educational tool.

But what is Minecraft? Here’s what you need to know.

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Write to Arpita Aneja at arpita.aneja@time.com.

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