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: An early draft suggested a different start for Dr. Eggman. Instead of his active pursuit of the Phantom Ruby, he would have begun the game depressed in his bedroom until the Hard Boiled Heavies went rogue, angering him enough to return to villainy.

: Internally, the Lava Reef Zone boss area is referred to as "Act 3," and a corresponding title card sprite exists, suggesting some zones were originally planned to have more than two acts. Unused Objects : sonic-mania-game

For a deep dive into these technical leftovers, you can check community-driven archives like The Cutting Room Floor or Sonic Retro . : An early draft suggested a different start for Dr

: A scrapped boss for Studiopolis Zone that used a rock-paper-scissors mechanic. sonic-mania-game