(Unknown) is a catch-all credit attached to games where the company responsible for the development or publication of the game are not listed in the game information or are not yet listed in the database.
To make a correction to an item that is (Unknown), do not add publisher- or game-specific information to this entry, as it is attached to hundreds of database items. Instead, use the Submit Corrections button in the relevant game entry(-ies). Before you can list a publisher with a game which is not yet in the database, you must first add that publisher at Misc --> Add Publisher.
