You will need a Super Nintendo emulator to play Dual Orb 2. You can download one 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.
This is Dual Orb 2 pre-patched with the fan-based English translation. It's a great game with a quality English translation!