Youtube user SethBling has (with help from p4plus2 and MrCheeze) injected the entire Flappy Bird source code into Super Mario World using various glitches. This type of code injection has been done before, but only with pre-programed controller inputs through a computer (TASBot). You may have seen that done during AGDQ a few years ago. This is the first time it’s been done entirely through human input.
This video talks about how he did it.
This shit’s insane, man.
It’s basically programming a game by playing a game, I can barely even beat Mario World! lol.
Here is the video from AGDQ in 2014.