Sonic Jam
"Sonic Jam" is a compilation which contains the four main "Sonic the Hedgehog" games released on the Sega Genesis: "Sonic the Hedgehog", "Sonic the Hedgehog 2", "Sonic the Hedgehog 3", and "Sonic & Knuckles". Unlike future "Sonic" collections, "Sonic Jam" does not use a Genesis emulator; the games are proper ports, and all are nearly identical to the original Sega Genesis releases, with the exception of minor bug fixes. "Sonic Jam" emulates "Sonic & Knuckles" "lock-on technology"—a special feature that allows the player to merge elements of "Sonic & Knuckles" into previous games, resulting in changes to the level design as well as the choice to play as Knuckles the Echidna in "Sonic the Hedgehog 2" and Tails in "Sonic & Knuckles".
Sonic the Hedgehog (2006 video game)
To celebrate the "Sonic" franchise's 20th anniversary in 2011, Sega released "Sonic Generations", which remade aspects of past "Sonic" games. The PlayStation 3, Xbox 360, and Windows versions feature a remake of "Sonic the Hedgehog"s "Crisis City" level, and every version, including the Nintendo 3DS version, includes a reimagined version of the boss battle with Silver. The decision to include "Sonic the Hedgehog" stages and bosses in "Sonic Generations" was criticized by critics and fans of the series; Jim Sterling of "Destructoid" referred to the Silver boss fight as the "catch" of the otherwise high-quality game.