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.
Platform game
1990 marked the release of the Super NES, along with the eagerly anticipated "Super Mario World". In order to fend off the new competition, Sega released "Sonic the Hedgehog". Whereas Nintendo's offering featured a conservative design, true to the "Mario" tradition, "Sonic" showcased a new style of design made possible by a new generation of hardware. "Sonic" featured large stages that scrolled effortlessly in all directions, as well as all manner of uneven terrain, curved hills, and a complex physics system that allowed players to rush through its levels with well-placed jumps and rolls. Lastly, there was the game's eponymous main character. Sega decided to give Sonic a rebellious personality in order to appeal to older gamers, and super speed to help show off the "Genesis"' hardware capabilities. The game proved to be a massive hit, was a successful pack-in with new systems, and cemented the view that platform games would make or break a console.