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 (character) "Sonic & Knuckles", both released in 1994, saw Sonic and Tails battle Robotnik again, with the additional threat of Knuckles, who is tricked by Robotnik into thinking Sonic is a threat. "" (2010–2012) continues where the story of "Sonic 3" left off, reducing Sonic to the only playable character and releasing in episodic installments. The second episode sees the return of both Tails as Sonic's sidekick and Metal Sonic as a recurring enemy. Other two-dimensional platformers starring Sonic include "Sonic Chaos" (1993), "Sonic Triple Trouble" (1994), "Sonic Blast" (1996), "Sonic the Hedgehog Pocket Adventure" (1999), "Sonic Advance" (2001), "Sonic Advance