Amy Rose’s birthday celebration aboard the Mirage Express takes an unexpected turn when Sonic becomes the victim in a murder mystery party. The player steps into the role of a new character beginning their first day working on the train, then joins its colorful cast to investigate what happened. The story’s central question is whether the incident is merely part of an innocent game or points to something more sinister.
Investigation is built around interrogating familiar Sonic characters, giving the adventure a character-focused mystery format rather than describing it as an action-driven installment. The setting has its own cast and atmosphere: players encounter the retiring Conductor and explore hand-drawn landscapes and characters that bring the Mirage Express to life. That mix of whodunit framing, series regulars and a new protagonist gives the game a distinct place within the Sonic universe.
The store description also presents it as a casual, indie, simulation and free-to-play game. The premise offers a self-contained mystery setup around Amy’s party, while the character interactions and train setting provide the adventure’s defining flavor.
