This is Brady Games guide to Sonic Adventure 1. It got the license to be "The official strategy guide". The dot on the cover proclaims 'maps for every stage' which was important at this time because it was the first anyone had of real 3D Sonic.
When SA1 was first released, several retailers did discount/bonus or bundle deals where you could get this guide if you pre-ordered a dreamcast, the game itself or some other combination. The guide itself is decent with lots of pages, screen shots and some character art/stock art through out.