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Why does Super Mario Bros. start off on level 0?

April 26, 2017Bros level mario

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Why does Super Mario Bros. start off on level 0?

1 Answer

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This happens if you’re using a hacked copy of the Super Mario Bros. ROM image. The hacked version is reading from uninitialized RAM, apparently to get the starting level number. This bad copy of SMB was likely extracted from a bootleg multicart, which would have had a menu run before the game started, initializing RAM and setting the starting level.