Abstract This is a collection of internal materials from Sega of America, notably documenting the development of Sonic the Hedgehog for English-speaking audiences. The materials are dated between 1990 and 1994.

Overview The Tengen, Inc. records contain artwork, promotional and trade show materials, posters, correspondence, photographs, assembly drawings, and schematics. A sizeable portion of this collection covers marketing and publicity in the form of sell sheets. The bulk of the materials are dated between 1987 and 1994.