The machines are compatible with original game cartridges and accessories, as well as wireless controllers from 8Bitdo. The Mega Sg is further compatible with the Sega CD using its edge connector, but not the 32X because it uses a patch cable to connect to the original console.
Mortal Kombat Nitro was meant to be a faster, bloodier version of the censored SNES version, but it was canceled before it could happen. The developer who conceived the project explains Mortal Kombat Nitro was lost forever.