You will need a PlayStation 1 emulator to play Castlevania: Symphony of the Night, and a Saturn emulator to play the Saturn version. You can download these emulators from my emulators page. If you need assistance with any of the emulators offered on my site, check out my emulation help subsite: Video Game Emulation for Newbies.
What's the difference between “CHD” and “BIN/CUE”? CHD is the latest file format for CD-based games. It guarantees that the game will work effectively with modern PlayStation 1 emulators (DuckStation, RetroArch, Mednafen). BIN/CUE is an older format; it's best for older PlayStation 1 emulators (ePSXe, pSX). For the Saturn release, the BIN/CUE should work fine with any Saturn emulator (RetroArch, Mednafen, uoYabause, SSF).
The original North American release for the PlayStation 1.
The Sega Saturn version of Symphony of the Night. In this version you can also play as Maria or Richter. There are also two new map areas to explore. This was not released outside of Japan. However, the download I have here is the English fan translated version. Using the PSP version as its template, this translation project for Dracula X: Nocturne in the Moonlight (the game's Japanese title) adds the following: