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.
Educational games in the Sonic series
In 1996, Sega and Orion Interactive collaborated to produce "Sonic's Schoolhouse", an educational game in the Sega PC brand for Microsoft Windows. It was developed using a game engine similar to "Wolfenstein 3D"s and ten educators and psychologists helped create the game's challenges. A cartoon clock was originally the star of the game but was replaced with Sonic; thus, "Sonic's Schoolhouse" is only tenuously connected to the rest of the franchise. The game was released as part of Sega's 20 million "Blue is Back" marketing campaign to promote six "Sonic" games releasing in the holiday shopping season; advertisements for the game were run in magazines and it was promoted in store displays. "Sonic's Schoolhouse" also came bundled coupons worth 40 in discounts for "Sonic" merchandise, including comics and plush toys.