Sonic the Hedgehog 2 (Sega Master System)

Advances made in this game include Sonic's ability to grab back rings scattered when hit by an enemy as well as being able to smash through certain walls, capabilies not implemented in the 8-bit versions of the original title. Oddly enough, there apears to be no Spin Dash, though this may be because this game was released before the Genesis version, which introduced the Spin Dash. Uniquely, this game includes levels in which Sonic must ride a mine cart, and a hang glider, the latter under full player control and a reasonable simulation of physics. There are seven zones in total, each comprising three acts. In the final act, that level's boss is faced, but not even a single ring is available to Sonic, making defeating the boss an incredible challange. Item boxes are largely the same as the first game (although the restart marker and shield devices have been removed), and as usual, Chaos Emeralds are scattered throughout the stages. Each is found in the second act in each of the first five zones. If the player collects these five and then destroys Mecha Sonic (called "Silver Sonic" in the English manual) in the sixth zone, the sixth is awarded and the player may access the final stage (Crystal Egg), in the third act of which Doctor Robotnik is faced in a climatic boss battle. Players able to complete the full task are rewarded with the game's "good ending"; for those who fail to collect all of the emeralds, play ends after Mecha Sonic's destruction with a more downbeat end sequence (in which Tails is assumed to be dead).