Region codes

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In the late 1980, Sega made the choice of localising their releases for specific countries. Unlike Japan, the rest of the world did not always follow the same guidelines when it came to numbering products, so this system may not work for all releases. It was most widely practised in Europe.

The format is usually as follows:

First-Party:

MK-XXXYYY-ZZ

Third-Party:

T-XXXYYY-ZZ

in which green symbolises the First-Party MK-Series Code or Third-Party T-Series Code, and purple dictates the region. The amount of numbers may vary, and some codes lack the "MK-" or "T-". Often European country codes only apply to packaging - the cartridges or discs may be identical to other European releases.

The system came into use during the days of the Sega Mega Drive, and was passed on to the Sega Saturn and Sega Dreamcast. Many publishers, notably Electronic Arts did not use this system, and it was not used at all in Japan or North America.

Code	Region	Notes
05	United Kingdom	Older UK releases may use 50.
06	Spain	Sometimes paired with Italy
07	Asia	Not including Japan and South Korea
08	South Korea
09	France
11	China	Distributed by Freeton Co.
13	Italy
16	China	Distributed by Acer TWP Corp.
18	Germany
20	The Netherlands
27	France/Spain
40	China	Mega Drive releases
45	Brazil
50	Europe	Used for non-localised European content.
51	Italy	Saturn releases
53	United Kingdom/France/Germany/Spain	How this differs from 50 is unknown.
55	The Netherlands
58	Germany/France/The Netherlands
59	France/The Netherlands
61	United Kingdom/Spain/Italy
64	United Kingdom/France/Germany
78	Scandinavia
91	United Kingdom/The Netherlands

Other consoles have different methods. For example, Nintendo currently employs a coloured triangle system.