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.
Educational games in the Sonic series
In 1996, Sega and Orion Interactive collaborated to produce "Sonic's Schoolhouse", an educational game in the Sega PC brand for Microsoft Windows. It was developed using a game engine similar to "Wolfenstein 3D"s and ten educators and psychologists helped create the game's challenges. A cartoon clock was originally the star of the game but was replaced with Sonic; thus, "Sonic's Schoolhouse" is only tenuously connected to the rest of the franchise. The game was released as part of Sega's 20 million "Blue is Back" marketing campaign to promote six "Sonic" games releasing in the holiday shopping season; advertisements for the game were run in magazines and it was promoted in store displays. "Sonic's Schoolhouse" also came bundled coupons worth 40 in discounts for "Sonic" merchandise, including comics and plush toys.