Sonic Mania, the highly acclaimed retro throwback from last year, is getting an expansion with two new playable characters.

Sonic Mania Plus, which will be getting a physical release, adds additional content to the game. The most significant is the inclusion of Mighty the Armadillo and Ray the Flying Squirrel: a couple of obscure characters that appeared in a 1993 arcade game called SegaSonic the Hedgehog. Additional changes include an all-new Encore Mode, and the ability for four players to compete in multiplayer.

Sonic Mania Plus will be getting a full retail release with a reversible cover and art book, which will be priced at $29.99. Existing players will also have the option to upgrade to Plus, although pricing has not been revealed yet.

Sonic Mania Plus will be releasing Summer 2018.