New Sonic 3D Blast & Sonic Adventure Development Sketches Released by Satoshi Okano

New Sonic the Hedgehog and Samba de Amigo development sketches by Satoshi Okano have been released. All of these sketches were from during the development of several titles for both franchises. Character sketches pertaining to the Sonic the Hedgehog series would become official art for Sonic 3D Blast and other sketches were intended to be concept art for Sonic Adventure, including a sketch of the interior of the Egg Carrier, and a sketch of a character featured in multiple billboard advertisements in Speed Highway.