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 Spinball
Morawiec believed that the game would face "acceptance challenges" from both fans and the gaming media, as "Sonic the Hedgehog Pinball" strayed away from the traditional platforming genre. After returning home to the United States from Europe, Morawiec was surprised to find that the game had sold well, and was pleased that it benefited from the franchise's popularity. Nonetheless, he regretted that the team had lacked time to "polish" the game properly. After the Game Gear title "Sonic Drift" received poor reviews in Japan, Sega released an 8-bit port of "Sonic Spinball" for the Game Gear in its place worldwide in late 1994. It was also released for the Master System in Brazil and Europe in 1995. The 8-bit version is mostly identical to the Genesis game, albeit with downgraded visuals and different, more platforming-oriented bonus stages. The Master System version was released near the end of the console's lifetime and did not sell well, and became a valuable collector's item.