Video explaining how a series of glitches in Super Mario Bros 3 are exploited to warp to the end of the game, without crashing it.
This feat is possible by an in-depth knowledge of the game at the assembly level and a rock-solid execution. Assembly instructions are coded by moving and killing enemies at very precise locations and timestamps.
Technical details here https://pastebin.com/mPYVMA56
HN discussion: https://news.ycombinator.com/item?id=24456247