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.
Sega CD
The Sega CD supports a library of over 200 games created both by Sega and an array of third-party publishers. Included in this library are six games which, while receiving individual Sega CD releases, also received separate versions that utilized both the Sega CD and 32X add-ons. Among the games released for the add-on were a number of FMV games, including "Sewer Shark" and "Fahrenheit". Well-regarded games include "Sonic CD", "" and "", "Popful Mail", and "Snatcher", as well as the controversial "Night Trap". Although Sega created "Streets of Rage" for the Genesis to compete against the SNES port of the arcade hit "Final Fight", the Sega CD received an enhanced version of the latter game that has been praised for its greater faithfulness to the arcade original. "" was noted for its impressive use of the system's hardware as well as its violent content. In particular, "Sonic CD" garnered critical acclaim for its graphics and new time travel elements, which improved upon the traditional "Sonic" formula. The Sega CD also received enhanced ports of games from the Genesis, such as "Batman Returns" and "Ecco the Dolphin".