Sonic & Knuckles

Sonic & Knuckles is a platform game in the Sonic the Hedgehog series, developed by Sonic Team in collaboration with Sega Technical Institute, and published by Sega for the Sega Mega Drive/Genesis in 1994. It is the direct sequel to Sonic the Hedgehog 3, which was released earlier that year. The game features unique "lock-on technology" which enables another cartridge to be plugged in via the socket on top.

Sonic the Hedgehog 2 (16-bit)

Sonic the Hedgehog 2, or simply Sonic 2, is a platform game developed by Sonic Team in collaboration with Sega Technical Institute, and published by Sega for the Mega Drive/Genesis. It released in Japan on November 21 of 1992 and in North America and Europe three days later on November 24. It is the sequel to Sonic the Hedgehog and was followed by Sonic 3 in 1994. The game introduces Miles "Tails" Prower as an addition to the cast and a new playable character.

The story follows Sonic the Hedgehog and Tails on their mission to stop the evil Doctor Robotnik from stealing the chaos emeralds to power his Death Egg. Sonic and Tails must defeat Robotnik's army and free their friends.

Six months after its release it had sold around six million copies and became the best selling game on the Mega Drive. The game was compatible with Sonic and Knuckles' lock-on feature which allowed the player to play as Knuckles in Sonic 2 It has been included in a number of compilation packages on a range of platforms; on June 11, 2007, the game was made available on the Nintendo Wii's Virtual Console, and released for Xbox Live Arcade on September 12, 2007.

Sonic Jam

Sonic Jam is a video game for the Sega Saturn and Game.com. The Saturn version is a compilation of titles in the Sonic the Hedgehog series originally released on the Sega Mega Drive/Genesis. It was released in Japan on June 20, 1997, in North America on July 31, 1997 and in Europe during the month of August 1997.

It includes the main Mega Drive/Genesis anthology (including Sonic & Knuckles and its lock-ons); Sonic Spinball, Sonic 3D Blast and Dr. Robotnik's Mean Bean Machine are not featured. The compilation also includes a 3D "Sonic World", which allows players to access virtual museums featuring Sonic the Hedgehog history, art, music and advertisements, as well as remastered and uncut animation sequences from Sonic CD. Sonic World functioned as both a hub for the extras and as its own game, utilizing missions such as ring-collecting, reaching markers, or finding Tails. Completing all the missions would unlock the credits for Sonic Jam.

Games included in this collection are:

• Sonic the Hedgehog
• Sonic the Hedgehog 2
• Sonic the Hedgehog 3
• Sonic & Knuckles

Sonic R

Sonic R is a racing game developed by Traveller's Tales and Sonic Team for the Sega Saturn and PC, the latter version being ported to the GameCube in Sonic Gems Collection. It features characters from the Sonic the Hedgehog series. The game is characterized by the same sense of environmental openness in the Sonic platformers. It contains colorful 3D graphics combined with a strong soundtrack by Richard Jacques (including songs performed by British singer T. J. Davis).