Libretro is a simple but powerful development interface that allows for the easy creation of emulators, games and multimedia applications that can plug straight into any libretro-compatible frontend. This development interface is open to others so that they can run these pluggable emulator and game cores also in their own programs or devices. PicoDrive is a Sega 8/16 bit video game system emulator. It's optimised for ARM, and has lower accuracy than Genesis Plus. However, it features 32X emulation, whereas Genesis Plus doesn't.