Sonic the Hedgehog 2 is a 16-bit 1992 platform video game that was developed by Sonic Team members working at the Sega Technical Institute, and published by Sega for the Sega Genesis/Mega Drive console. It was released in Japan on November 21, 1992 and in North America and Europe on November 24, 1992. It is the sequel to Sonic the Hedgehog and was followed by Sonic the Hedgehog 3 in 1994. The game introduces Sonic's friend, a fox named Miles "Tails" Prower as a new playable character.
The story follows Sonic and Tails, on their mission to stop the evil Dr. Robotnik from stealing the Chaos Emeralds to power the Death Egg. Sonic and Tails must defeat Robotnik's army and free their friends.
The game has sold over 6 million copies, making it the second best selling game on the Sega Genesis, behind only its predecessor. The game was compatible with Sonic & Knuckles, which possessed a "lock-on" feature which allowed the player to play as Knuckles the Echidna.