Final Battle (not enough space in the title to add that) and The Best Ending you can get in "Castlevania II: Simon's Quest". To get this ending, you have to beat the game in under 8 hours and use a minimal amount of continues.
I'm not going to upload the other 2 endings but if you want to see them go check out Laisteve66's videos, he has them there.
http://www.youtube.com/laisteve66
From Wikipedia:
Castlevania II: Simon's Quest, known in Japan as , is an action-adventure role-playing platform game produced by Konami. Learn about Castlevania II: Simon's Quest
