How did they fit open world games like Zelda and the original Final Fantasy into NES cartridges

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With some basic Googling It looks like that the max size was around 512 KB. How is this even possible to fit games of this size onto such little memory? What is this magic?

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Anonymous 0 Comments

Look up a picture of the first Zelda. The screen is made of little pictures (tiles) on a grid. How big is the grid? I count 17 by 11 tiles. So that’s 187 bytes for a screen. How big is the world? If you look up a map, it’s 16 by 8 screens. Maybe triple that because of all the dungeons and stuff. So that makes 384 screens which are 187 bytes each, which is 71808 bytes. Still plenty of bytes left.

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