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 3D Blast
"Sonic 3D Blast" was the final "Sonic the Hedgehog" game produced for the Sega Genesis, and was developed as a swan song for the system. Sega had discontinued official support for the Genesis in 1995, but intended to produce the game for the 16-bit console because games typically sell for one to two years after their platforms' discontinuation. The game's basic concept was conceived by members of Sonic Team during the development of "Sonic the Hedgehog 3", but most of the programming was done by the British studio Traveller's Tales because Sonic Team was developing "Nights into Dreams". According to founder Jon Burton, Traveller's Tales had just finished developing a "Toy Story" game and wanted to start developing games for 32-bit systems such as the Saturn and PlayStation. Sega, impressed with their work on "Toy Story" and "Mickey Mania", approached them with "3D Blast"; as "Sonic" was extremely popular at the time, the concept "got [their] attention". In retrospect, Burton stated that he believed the game was commissioned because "Sonic X-treme", in development for the Saturn at the time, was struggling, and Sega wanted to bring Sonic into the 3D era of gaming.