This is a tool-assisted speedrun. For more information, see tasvideos.org/991M.html. TAS originally published on 2007-11-12.
A rare instance of a Japanese-made NES game based on a U.S.-originated comic book (en.wikipedia.org/wiki/Bucky_O'..., Bucky O'Hare (1992) provides a player with a good combination of platforming action similar to Mega Man, an interesting plot, and convincing production values. You can play as one of the five unique characters, which you are free to select at any time, after saving them from the clutches of the Toad Empire. Each character has special abilities required to take advantage of in order to pass through the game's numerous variably designed stages, ranging from single-screen puzzle rooms to autoscrolling shoot-'em-ups.
Interesting fact about this game is that Konami used to implement unconventional ways of piracy protection, in this particular case by making each hit or an otherwise harmful collision in the game result in an instant death if you play it illegitimately. Apparently, this was how a large amount of people were used to playing it in pre-emulation era, without ever finding out Konami's little sabotage.
This movie by AnS is set up in a fashion that imitates this handicap by playing the game in hard mode (accessing it through a password), where every hit results in death. Other than that, it also improves the previous movie by 2 minutes 48.7 seconds, using several major glitches and a lot of small tricks explained in great detail in the author's comments (tasvideos.org/1738S.html).