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 Forces
"Sonic Forces" was announced alongside "Sonic Mania" under its codename during a twenty-fifth series anniversary event held by Sega at the San Diego Comic-Con on July 22, 2016. The presence of both Classic and Modern Sonic in the initial teaser trailer led some journalists to believe it was a sequel to "Sonic Generations", but Iizuka clarified that it was a separate game. The game was released worldwide on Microsoft Windows, Nintendo Switch, PlayStation 4, and Xbox One in November 2017. Prior to the game's launch, Sega released a four-part prequel comic written and drawn by Ian Flynn and Adam Bryce Thomas, who previously worked on Archie Comics' "Sonic the Hedgehog" series. A bonus edition was also released containing controller skins and downloadable clothing items for the Avatar based on other Sega games, such as "Jet Set Radio", "Puyo Puyo", and "Persona 5". A tie-in racing game for iOS and Android devices, "Sonic Forces: Speed Battle", was released in select regions in September 2017. After the game's release, several updates featuring new content were released, such as an in-game shirt for the Avatar featuring "Sanic", an internet meme of a poorly drawn Sonic, and the ability to transform into Super Sonic. The Super Sonic DLC was released for free, but was initially planned as paid DLC.