Why do glitch levels in Super Mario Bros. look the way they do? And how are levels stored in the game's ROM anyway? It's all explained right here.
CORRECTION
At 11:20, The brown block and horizontal pipe are swapped--the pipe should have index 1001 and the brown block should be 1010.
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INLINE LINKS
Part 1: https://youtu.be/hrFHNgJlJSg
Part 2: https://youtu.be/B8o_VpY9scs
Animation of Every Level Being Loaded: https://youtu.be/1whju31WAPA
Maps of all Levels: https://rgmechex.com/tech/smb1levels/index.html