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 and its 2004 re-release Sonic Mega Collection Plus, 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 Western localization. Developer Sonic Team conceived the compilation to introduce younger players to older Sonic games. One game they wished to include, SegaSonic the Hedgehog, was excluded due to emulation difficulties. Sega released Gems Collection for the GameCube and PlayStation 2 in August 2005. Reviews were mixed or average; critics were divided over whether the package would satisfy players. They preferred Sonic CD and Vectorman, but found Sonic the Fighters and Sonic R mediocre, and disliked the Game Gear games. Some were disappointed by the absence of the Streets of Rage games in the International version and other Sonic games like Knuckles' Chaotix and Sonic the Hedgehog Pocket Adventure. Games Sonic Gems Collection is a compilation of obscure video games published by Sega for various consoles, such as the Sega CD, Sega Saturn, and Game Gear. It primarily focuses on Sonic the Hedgehog games, such as Sonic CD (1993), Sonic the Fighters (1996), and Sonic R (1997). It also includes six of the twelve Sonic games released for the Game Gear, with the other six having been included in the previous compilation release, Sonic Mega Collection Plus. These games encompass various genres, such as platforming, fighting, pinball, and puzzle. Additionally, players can unlock several Sega Genesis games unrelated to Sonic, including the two Vectorman games (1995 and 1996). Four games, Bonanza Bros. (1990) and the Streets of Rage trilogy (1991–1994), only appear in the Japanese version and are not included in any international releases. Each game is mostly identical to its initial release, but some were changed; for example, Sonic R runs at a higher frame rate. Players can view scans of the original instruction manuals for each game,