The Games

Castlevania: Symphony of the Night (U) 387 MB The original release for the PlayStation 1.
Akumajo Dracula X: Gekka no Yasoukyoku (J) 383 MB The Sega Saturn version of Symphony of the Night. In this version you can play as Maria or Richter. There are also two new map areas to explore. Unfortunately, this was not released outside of Japan so an English version is not available.
Castlevania Dracula X Chronicles (U) 729 MB This is the PSP remake of the PC-Engine CD release of Dracula X. It includes a full port of Castlevania: Symphony of the Night. View this video for directions on how to do that.

Playing Castlevania: Symphony of the Night on Your Computer

You can play Castlevania: Symphony of the Night right on your computer with a Playstation (PS1) emulator. The other games require a PSP emulator and Saturn emulator. I have the best emulators for download in my emulators page. And if you need assistance with the Playstation emulator, check out my emulation help site, Video Game Emulation for Newbies, for help.