Sonic Mania Plus is an updated version of Sonic Mania that includes the Encore DLC. Digital versions of Sonic Mania on all platforms can be upgraded to Sonic Mania Plus by purchasing the Encore DLC separately.
Plus is also available as a physical release and marks the first time any version of Sonic Mania was available on physical media. Released for Xbox One, PlayStation 4 and Switch, in addition to including the complete version of Sonic Mania Plus on a disc/cartridge it also comes packaged with a reversible cover with alternate box art, an art book and a holographic outer sleeve.