Mario ROMhacks make even hardcore gamers cry.

Remember Super Mario Frustration? Kaizo Mario World is another of those super-hard Mario level hacks, this one of Super Mario World. Someone played through its first level 134 times, with save states, recording all his deaths, then digitally composited them into one trip through the level. The result was Many-Worlds Mario. (For those interested, here's a video of a tool-assisted perfect run of much of the game. Here's the rest.