Sonic the Hedgehog Pocket Adventure
In August 1999, SNK announced that they were collaborating with Sega to develop a "Sonic the Hedgehog" game for their Neo Geo Pocket Color handheld system. The game was developed by SNK, with supervision from Yuji Naka and Sonic Team at Sega. This marked the first time Sega was directly involved in the development of a "Sonic" game for a non-Sega platform. The team planned for "Sonic Pocket Adventure" to be a return to the classic 2D gameplay style found in the "Sonic" games on the Sega Genesis. In particular, many game design and visual elements are borrowed from "Sonic 2". The game's background music tracks are also 8-bit renditions of music from "Sonic 3". "Sonic Pocket Adventure" was released first in North America on December 4, 1999. SNK released a system bundle with the game included for the holiday season. The game was released in Japan two weeks later, and in Europe in February 2000.
Sonic Gems Collection
Sonic Gems Collection is a 2005 compilation of Sega video games, primarily those in the "Sonic the Hedgehog" series. The emulated games span multiple genres and consoles—from the Sega Genesis to the Sega Saturn—and retain the features and errors of their initial releases with minimal edits. Player progress is rewarded with demos of other "Sonic" games, videos, and promotional artwork spanning the history of the "Sonic" franchise. While its 2002 predecessor, "Sonic Mega Collection", comprised the more popular "Sonic" games, "Gems Collection" focuses on more obscure games, such as "Sonic CD" and "Sonic the Fighters". Other non-"Sonic" games are included, but some, such as the "Streets of Rage" trilogy, are omitted in the North American localization.