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There are lot of snes emulators for different softwares. So basically I have used for windows 10 like RetroArch, ZSNES etc.
 
I agree with others, RethroArch Snes a.d
Provinece, snes9x and there really are a lot of others if you just look around, google search for your firmware and read reviews for what emulators work best for most people on the iOS version your running and the specific type of device you are going to be emulating from, this will help to learn how to mod and control settings and graphics for the best experience with your hardware & software
 
The best SNES emulator is SNES9x. I have been using this emulator last 6 month. It is compatible with the Linux, MAC, and Windows. SNES is till now considered to be one of the most significant victories that Nintendo has ever had in the field of consoles and gaming. Surely you have heard about the fantastic games such as MarioKart, Metroid Prime and The Legend Of Zelda and so many other Nintendo masterpieces. So, SNES9x that is one of the best SNES emulators and has almost the same user interface like that of KEGA Fusion.
 
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