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: After the Sequel
"After the Sequel" is a 2D platformer in the style of the "Sonic" games for the Sega Genesis. As such, it lets the player control either the blue hedgehog Sonic or his orange fox friend Tails. Both characters can move left and right with the arrow keys and jump with the "Z" key; Tails can also fly to reach areas Sonic cannot. The game takes place in seven levels, known as zones, each divided into three acts followed by a boss fight with Doctor Eggman. These zones are designed for fast-paced gameplay, featuring typical "Sonic" obstacles such as bottomless pits and vertical loops. The zones are based on various themes, including haunted houses, cities, magma caverns, winter theme parks, and sugar processing plants.