As the Heavies rush to get away from the three, Sonic, Tails and Knuckles join forces to stop them. The group gets catapulted to Green Hill, where it is revealed that the Phantom Ruby's power has transformed the Hard Boiled Heavies into more powerful Egg-Robos and granted them free will. As they do so, space-time suddenly warps around them, with the heroic duo, the robots, and Knuckles the Echidna, who was relaxing nearby, getting caught in the warp. Sonic and Tails arrive on Angel Island just as the Hard Boiled Heavies excavate the source of the signal, a mysterious gemstone known as the ' Phantom Ruby', from the ground. Sonic and Tails witnessing the Hard Boiled Heavies extract the Phantom Ruby. Realizing it could be a source of unspeakable power, the scientist immediately dispatches his elite robot minions, a group of five elite Egg-Robos known as the Hard Boiled Heavies, to retrieve it. Eggman, having discovered the dimensional breach, has detected this energy signature too. The two thus head to Angel Island in the Tornado. Despite not being the Chaos Emeralds, this reading is remarkably powerful, and the fox convinces the hedgehog to investigate it with him. While he and Sonic are relaxing, Tails picks up this odd energy reading. Some time after the Death Egg saga, a sudden dimensional breach occurs in the earth's atmosphere, causing a unique energy wave signature to appear on Angel Island.

Spoiler warning: Plot, ending details or any kind of information follow. Sonic Mania Plus includes the return of Mighty the Armadillo and Ray the Flying Squirrel as playable characters, as well as a 4-player Competition Mode and 'Encore Mode'.

Downloadable content to the base game, titled 'Encore DLC', was released alongside the physical version. A definitive version of the game, titled Sonic Mania Plus, was released on July 17, 2018. The game saw a physical release for Nintendo Switch, Xbox One, and PlayStation 4 on November 5, 2019. The game was announced on Jand released digitally on Augfor Nintendo Switch, Xbox One, and PlayStation 4, and on August 29 for PC. The game emulates the gameplay and 2D sprite animation of the original Sega Mega Drive Sonic games. Sonic Mania was developed by Christian Whitehead, who had previously worked on enhanced ports of early Sonic games, with the aid of Headcannon and PagodaWest Games, who were chosen for their work in the Sonic fangame community and was published by Sega. The storyline of the game also ties into the events of Sonic Forces. Eggman and his Hard Boiled Heavies from harnessing a mysterious energy source known as the Phantom Ruby.

The game is shortly set after the conclusion of the Death Egg saga and follows Sonic, Tails and Knuckles as they try to keep Dr. Sonic Mania ( ソニックマニア, Sonikku Mania ?) is a side-scrolling platformer video game in the Sonic the Hedgehog franchise which acts as a celebration of the series' 25th anniversary.

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