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 2 with Dreams Come True in London, working on their fifth album "The Swinging Star". As a gift to Sonic Team, Masato produced an alternate version of the ending theme with Dreams Come True, which was included in the album they were recording at the time. In 2011, the stage music from Chemical Plant and Casino Night Zone were remixed by Sega for use in "Sonic Generations". Later in October of the same year, a three-disc compilation of the music from "Sonic the Hedgehog" and "Sonic the Hedgehog 2" was released in Japan. Alongside music from the game, the compilation includes