Sonic the Hedgehog platforming of the main levels. The 16-bit "Sonic the Hedgehog " consisted of a giant rotating maze, which many considered a major technical achievement. The most common special stages, however, were segments with the character running through a long tunnel to collect certain items. 3D "collect item" levels, as in "Sonic 3" and "Sonic & Knuckles", used the same perspective but had Sonic collecting all the blue-colored orbs on the surface of a giant sphere. Finally, "Sonic Advance 2" employed a 3D ring-collecting stage, and "Sonic Chaos" ("Sonic and Tails" in Japan) used a variety of gimmicks for its levels.
Sonic the Hedgehog elements from the cartoons "Sonic the Hedgehog" and "Adventures of Sonic the Hedgehog". "Dr. Robotnik's Mean Bean Machine" was a puzzle game similar to "Puyo Puyo" that was set in the "Adventures of Sonic the Hedgehog" universe. "Sonic 3D Blast", an isometric, 2.5D platform game released in 1996 and developed by Traveller's Tales, featured Sonic running through pseudo-3D environments while trying to rescue Flickies from Doctor Robotnik. The Sega Genesis had "add-on" systems that incorporated "Sonic" games. "Sonic CD", released for the Sega CD, was a 2D platform game released in 1993. The game introduced the characters Amy Rose and