More Super Mario Bros. Mechanics Explained

If the game is limited to 3 objects per column, how can you get 5 sometimes? How does the 4-2 wrong warp work, and how do looping levels work? Is there anything different in the FDS release of SMB1? What about Super Mario All-Stars, and The Lost Levels? It’s all explained right here.
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See all levels being loaded:
Displaced Gamers video on the Minus World:
Super Mario Bros. glitch level maps:
SMB1 FDS glitch level maps:
SMBLL glitch level maps:

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