After Sonic the Hedgehog and his friends had found and "rescued" Knuckles the Echidna, the team headed back to Tails' workshop in Central City. There, Tails rewired the four Communicators they had found, retracing their signal and tuning them to Dr. Eggman's special electronic signature. Tails explained that the tracker would not specify Eggman's location, but it would beep as the team approached an Eggman Device. As the team explored the western area of Green Hill Zone, the Eggman Detector began to beep, and the team discovered Eggman's hidden base.
- The Eggman Detector looks exactly like a Med Emitter.
- Official In-Game description.