Castlevania: Aria of Sorrow, beaten in less than half an hour from a new game without taking damage from anything.

The author skips getting the Undine soul and a decently-sized portion of the castle by using an edge-of-ledge oversight in the game's programming to gain a little extra height.

There is quite a lot of luck manipulation in this movie, but some familiarity with the game is required to notice it.