Various mods that enhance the vanilla game are highly recommended, even for a first playthrough. One such notable mod is the Unleashed Project, which ports the 9 'daytime' stages from Sonic Unleashed into the game (replacing the vanilla stages). Sonic Generations features an active modding community players have produced a variety of mods for the game’s stages, models, visual effects, audio, and animations. this DLC was initially an exclusive GameStop pre-order bonus for the console versions that was later made available for purchase on Steam.

On September 29, 2016, all Steam users received the Casino Night DLC (an in-game pinball mini-game) for free. Unlike the console versions, the PC version removes the unlockable (emulated) copy of the original Sonic the Hedgehog (1991). The PC version of the game was released on Novemon Steam, with Europe and Australia exclusively receiving a physical release. The game was intended as a celebration of the 20th anniversary of the Sonic the Hedgehog franchise, with it featuring the play-styles and character designs of two different eras of Sonic ('Classic' and 'Modern') and levels spanning the franchise from 1991 to 2010. Sonic Generations is a single-player 3D platformer developed by Sonic Team and published by Sega.

10.2.2 Missing Cutscene for Casino Night DLC.

8.8 Modern Sonic's Quickstep sound is missing.

8.7 Crash when trying to play online ranking mode.8.4 Configuration Tool does not open/crashes.

Sonic generations unleashed shaders