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In Sonic Mania, the Chaos Emeralds were collected by Sonic, Tails, Knuckles over the course of their adventure. When Sonic got transported to the Egg Reverie Zone, where Dr. Eggman fought the Phantom King over the Phantom Ruby, Sonic used the Chaos Emeralds to go Super Sonic. After delivering the final blow to the villains, the Chaos Emeralds separated from Sonic (thus returning him to normal) and reacted to the Phantom Ruby, causing the ruby to take Sonic and itself through a warp to another dimension while the Emeralds scattered.
In gameplay, the seven Chaos Emeralds can be obtained by clearing the game's seven Special Stages. Within these stages, UFOs carry around their respective Chaos Emerald. If one of the playable characters in the game (Sonic, Tails or Knuckles) collects all seven Emeralds, they can enter their respective Super State in normal gameplay. In Sonic's case, collecting all seven Emeralds also allows the player to enter Egg Reverie Zone as Sonic, where the final boss of Sonic Mania is fought, after clearing Titanic Monarch Zone. Defeating the final boss will in turn unlock the true ending of Sonic Mania.
In other media
Sonic Mania Adventures
Eggman's status on the Chaos Emeralds.
In Sonic Mania Adventures, Dr. Eggman used Sonic's absence to look for the seven Chaos Emeralds, and eventually found four of them after digging around on Angel Island. The fifth one, which was in Sonic's possession, was later used by the hedgehog to lure Eggman into a trap the latter had set up for Sonic. The location of the last two Emeralds, however, were unknown to Eggman.[1][2] Eventually though, Eggman located the sixth Emerald on Angel Island and began excavating it, only for Sonic and Tails to claim it after they found and defeated him.[2]
The final Chaos Emerald was found by Mighty the Armadillo. However, he was forced to surrender it after Metal Sonic threatened to harm his friend Ray the Flying Squirrel. Metal Sonic thus took the Emerald and flew off to give it to Dr. Eggman.[3]
