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.
Game Gear
Over 300 games were released for the Game Gear, although at the time of the console's launch, there were only six software games available. Prices for game cartridges initially ranged from $24.99 to $29.99 each. The casings were molded black plastic with a rounded front to aid in removal. Games for the system included "Sonic the Hedgehog", "The GG Shinobi", "Space Harrier", and "Land of Illusion Starring Mickey Mouse", which was considered the best game for the system by GamesRadar. Later games took advantage of the success of the Genesis, Sega's 16-bit video game console, with games released from franchises originally released on the Genesis. A large part of the Game Gear's library consists of Master System ports. Because of the landscape orientation of the Game Gear's screen and the similarities in hardware between the handheld console and the Master System, it was easy for developers to port Master System games to the Game Gear.