Might and Magic, first released in 1986 for the Apple II and later receiving ports to many other systems, is the first installment in the series that would later evolve into a whole fictional universe. This universe encompasses both the actual Might and Magic games and a multitude of other subseries and spin-offs made in their own genres, including King's Bounty, Heroes of Might & Magic, and others.
Normally, this game is rather long. This movie by katsuster skips most of it by using a glitch that allows the player to get all the important items in a matter of minutes. It also improves on his previous run that used the same glitch by 12.8 seconds with better item management and strategies. For more details, you can read the author's notes.
katsuster has also provided a video of the run that has a map and important values next to the gameplay.