Udon Entertainment are publishing a History of Sonic hardcover book in collaboration with Sega in North America. At 300 pages in length, the book covers every 2D and 3D Sonic the Hedgehog game produced in detail, and also goes over Sonic crossovers and cameo appearances in other games as well.
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Also included in the book are features like an interview with Yuji Naka (see above) and character profiles of the series cast. You can grab the book off Amazon for $32.12, and Sega have shared a few preview pages to sample here.