GameIDs

Nintendo console titles are identified by a 6 character identifier known as a GameID.

Syntax
GameIDs have 4 significant sub-sections: 

System Code
Identifies the system the title is for.

Title Code
Identifies the title.

Region Code
Identifies the region the title is released in.

Publisher Code
Identifies the publisher. There may be regional variations (e.g. Electronic Arts is 69 in EU/NA, but sometimes 13 in JP).