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 Pocket Adventure Sonic the Hedgehog Pocket Adventure The game was released in December 1999 to positive reviews. Critics felt "Sonic Pocket Adventure" was a faithful adaptation of the traditional "Sonic" game formula, most importantly not making any sacrifices to the game's speed. Reviewers praised the game as one of the best among the Neo Geo Pocket Color's library, and commended the quality of SNK's hardware. Several members of the SNK development team later formed Dimps which went on to develop several more "Sonic" games for handheld devices. "Sonic the Hedgehog Pocket Adventure" is a platform game in the style of the classic