Final Fantasy 3 (NES) Final Battle
Ending Part 1 of 2:
http://www.youtube.com/watch?v=1-rDhvHS-4Y
Ending Part 2 of 2: http://www.youtube.com/watch?v=cVqZnJvWdC0
Final battle for Final Fantasy III on NES (Famicom to be more specific)
This is a fan translated NES/Famicom ROM of Final Fantasy 3, which never reached North American shores until it's Nintendo DS remake.
The final boss, Cloud of Darkness (no relation to Cloud from FF7, sorry fanboys), can be a pain in the butt to kill since it has alot of hitpoints and it can do over 1000 dmg to your whole party per turn. Easiest way to kill him is use Ninjas and Sages. Have your Ninja(s) throw Shruikens, which can be purchased at the secret shop in the Land of Eureka, while your Sage(s) cast Flare, Meteo or Bahamut when they aren't healing the party. I fought him at level 65 because I like to over-level but the guide I used recommends level 55 with a combination of Ninjas and Sages.