Region coding

From Sonic Retro

More than any other Sega system, the Sega Mega Drive is affected by differing forms of region coding, implemented so that games were optimised for (or locked out of) three main marketing regions; NTSC-J (Japan and parts of Asia), NTSC-U (North America) and PAL (Europe and Australia).

These pages show how games run on consoles from differing regions.