Ninja Gaiden - All Bosses (No Damage)

[@elbeto57]

2:25 Final Boss - Phase 1 2:57 Final Boss - Phase 2 3:49 Final Boss - Phase 3

[@GarieShrewsbury]

This has to be played on a hacked ROM, if you have spin slash in the Demon fight, right?

[@BattyFred]

You can definitely have the spin slash for the final fight. To have any mana for it, though, you need to die the first time you fight it, then go back through the level to fight him again.