Sonic the Hedgehog has been that the variant gameplay styles found in recent 3D games have strayed from the formula of the original series. Specifically, the series' jump to 3D has been noted as a declining point. In late 2010, Sega delisted several below-average "Sonic" games, such as the notoriously disliked 2006 game "Sonic the Hedgehog", to increase the value of the "Sonic" brand after positive reviews for the games "" and "Sonic Colors". Sonic the Hedgehog Sonic the Hedgehog is a video game franchise produced by Sega centering on a series of high-speed platform games. Sonic, the protagonist, is an anthropomorphic blue
Sonic the Hedgehog 2 was released in 1994, two years after "Sonic 2". The "Sonic & Knuckles" game cartridge features a special "lock-on" port into which the player can insert other Genesis cartridges. Attaching "Sonic 2" unlocks "Knuckles the Echidna in Sonic the Hedgehog 2", a variation of "Sonic 2" whereby the player plays as Knuckles the Echidna, a character introduced in "Sonic the Hedgehog 3" and not playable until "Sonic & Knuckles". Though the game is largely identical to "Sonic the Hedgehog 2", Knuckles is able to glide and climb walls, allowing him access to areas previously inaccessible to Sonic or Tails. However,