I was playing Minecraft the other day and went very, very far from my spawn point and eventually returned home. When I retraced my way back, I couldn’t wrap my head around how the game not only generates the environment but remembers the placement of everything as I return to the same places I had already been. With that in mind, wouldn’t the game be required to remember… an absurd amount of information as the user explores their world? How are the file sizes of these worlds not crazily big?
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The game has instructions on how to build the world instead of the world. It generates that world using the instructions based on the seed you give it. This has been a thing as far bas as the Atari 2600 and the game *River Raid*.
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