MD.emu is probably the best solution for SEGA Genesis emulators. It's an open source project that most other SEGA Genesis emulators are based off of. This one works with SEGA Genesis/Mega Drive games as well as SEGA CD and Mark III games. This makes it the most versatile emulator of the group.How many US Sega Genesis games are there?
In total, there are 28 unofficial games, 45 Genesis games, and 12 games that appeared on either the Sega Game Gear or Sega Master System.