An interesting video about NES Super Mario Bros.: "After 40 Years, Huge NEW Mario Glitch Discovered" by Kosmic:
https://www.youtube.com/watch?v=bNulp6cDqUU
Spoilers below!
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It is possible to jump to the end screen in NES Super Mario Bros. using arbitrary code execution (ACE) and without using another game to set up the RAM. However: beating the game with ACE is (a little) slower than without it, and the glitch only works in the Famicom Disk System version.













