Why is Minecraft such a popular game?

In terms of graphics, the game is sub-par. The concept of the game itself is far too simplistic too have acquired such a large fan-base, and there are no special features of the game that make it carry any more significance than other low-quality games, and yet it thrives economically and socially. What exactly is so great about Minecraft?

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Did you ever play with blocks as a kid? With generic wooden blocks you can create a castle, a road, anything your imagination will take yout.

Minecraft is all that and more.