The Super Mario Bros infinite 1-up OCT 28 2010
In a recent interview for the 25th anniversary of Super Mario Bros., Mario's baby daddy Shigeru Miyamoto revealed that the infinite 1-up trick was included in the game on purpose but that the minus world was a bug.
"We did code the game so that a trick like that would be possible," Miyamoto revealed. "We tested it out extensively to figure out how possible pulling the trick off should be and came up with how it is now, but people turned out to be a lot better at pulling the trick off for ages on end than we thought." What about the famed Minus World? "That's a bug, yes, but it's not like it crashes the game, so it's really kind of a feature, too!"