The Sonic the Hedgehog series has endured a tumultuous existence. Sonic debuted as a mascot character for the Sega Genesis and starred in several classic platformers for that console and the Sega CD. After basically shelving Sonic during the 32-bit Sega Saturn era, Sega finally decided to bring him back in a launch title for the Sega Dreamcast. Sonic Adventure received a warm reception, and yet it was the beginning of a dark time for Sonic.
You see, Adventure was the first fully 3D Sonic platformer and it introduced a host of problems that would only grow worse in follow-up titles: poor collision detection, largely on-rails game play (during the actual Sonic levels anyway), pointless town sections and side quests, terrible music, general glitchiness, numerous annoying furry pals for Sonic, and equally annoying voice work and storytelling. Each 3D Sonic sequel became progressively more heinous, culminating in 2006’s Sonic the Hedgehog, which remains the worst game I’ve ever played in my life.
Despite numerous missteps, Sonic’s popularity never fully disappeared. His fan base split into two camps though: one consists of furries and children who basically just don't know any better. The other camp remembers Sonic’s glory days and pleads for a return to the character’s roots. Sonic the Hedgehog 4: Episode I was made just for them.