The Hard Boiled Heavies are robots that were changed by the Phantom Ruby.The members of the Hard Boiled Heavies are Heavy gunner Heavy shinobi Heavy magician Heavy rider and Heavy king.They were once Eggrobo Badniks.In Sonic Mania after when the phantom ruby changed them they wanted to keep the Phantom Ruby but Dr eggman took it away later in the game Sonic the Hedgehog Miles Prower and Knuckles the Echidna fought them then in the final fight they were changed by the Phantom ruby turing them into the phantom heavies but still lost.In Sonic mania plus Sonic Tails Knuckles Mighty the armadillo and Ray the flying squirrel fought the Heavies again and in their Phantom forms but still lost.
The Hard Boiled Heavies before the Phantom ruby change