Sonic the Hedgehog
Due to the success of "Sonic" games on the Sega Genesis, the series was introduced to the Master System and the Game Gear. Sega began by releasing "Sonic the Hedgehog", a 2D platform game, in 1991. The game featured Sonic's ability to run and to jump at high speeds like its Mega Drive/Genesis counterpart but with notably different level design and music. Sega later released "Sonic the Hedgehog 2" another 2D platform game, in 1992. The game differed from its Genesis counterpart with different levels and music and by not including a "spin dash" maneuver. It also featured a different storyline in which Doctor Robotnik kidnaps Tails, who is non-playable in the Master System/Game Gear version. "Sonic Chaos"/"Sonic and Tails" (Japan), released in 1993, was similar to the earlier two Sega Master System/Game Gear "Sonic" games, but featured Tails as a playable character. A sequel, "Sonic Triple Trouble"/"Sonic and Tails 2" (Japan), a 2D platform game, was released in 1994 for the Game Gear and introduced a new character, Nack the Weasel, who, along with Knuckles and Doctor Robotnik, raced to collect the Chaos Emeralds. One of the last games for the Sega Game Gear, "Sonic Blast", was released in 1996 and featured prerendered sprites.
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".