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Illustration by Naoto Ōhshima featuring Sonic, Dr. Eggman, and Animals. This illustration was used on the European cover artwork, and on various merchandise such as paper tags on Japanese Sonic plush toys.
Concept of loop. Text translation: "Metallic kind of stage... The background is styled like south-east Asia, golden country, [...] (are) gold colored plating."
Concept of Green Hill Zone. Text translation: "CG styled stage... Blue skies and green[ery] are the basis, nothing till now, CG styled background."
Concept of unknown Zone. Text translation: "Rocky mountain and underwater stage... Japanese styled rocky mountain stage, with underwater scene. In the map, spin [jump] and you can cross the water, but various techniques make it possible to [...] the course."
Concept of Marble Zone. Text translation: "Stage where the land shakes... The underground has an amoeba shape and the ground shakes. The amoeba shaped terrain [...] with canals. Can also dive into the ground."
Published in "SPEC," this concept art shares similar features to the early Green Hill Zone demonstration at the 1990 Tokyo Toy Show, including the trees, the mountains' blocky foundation, and Sonic's pose.