This is a tool-assisted speedrun. This is a pacifist run which means that no enemies except the bosses got killed. Very good gameplay and funny movements make this movie to a must see.
From Wikipedia:
Ninja Gaiden II: The Dark Sword of Chaos, known in Japan as and as Shadow Warriors 2 in Europe, is a side-scrolling platforming video game developed and published by Tecmo for the Nintendo Entertainment System (NES). Learn about Ninja Gaiden II: The Dark Sword of Chaos
