Sega has unveiled original concept art from the Sonic Adventure games, as well as Sonic Heroes.
The art was unveiled on the official Sonic The Hedgehog YouTube channel as part of the Extra Life charity live-stream, which aimed to help raise money to benefit the Children's Miracle Network. Among the art pieces were several looks at the various stages from each game, including classic models for Sonic and Tails.
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The game developer also revealed the beta tracks for select stages of Sonic Adventure 2 as the final milestone of the livestream. The tracks include City Escape, Mission Street, Metal Harbor and Radical Highway. They were unveiled on the Tails' Channel Twitter account.
Sonic Adventure and its sequel Sonic Adventure 2 were released for the Sega Dreamcast, with the former serving as a launch title for the console. The games focus on Sonic and his friends' adventures to collect the Chaos Emeralds and prevent the end of the world. Sonic Adventure 2 also introduced multiple characters including Shadow the Hedgehog and Rouge the Bat.
Sonic Heroes features teams of characters racing to obtain the Chaos Emeralds and stop Doctor Robotnik from conquering the world. The game was the first multiplatform Sonic game, featuring high-paced gameplay and graphics.
Source: Nintendo Life