Reactive Factory

Reactive Factory is an important Robotnik's base, where he constructed and created Metal Knuckles and Tails Doll. This factory is completly automatic, and uses water as fuel to work. On an hidden room, inside this factory, Robotnik altered his Egg Mobile, so he could take advantage on the World Grandprix where his base served as a course. Reactive Factory was seen only on the videogame Sonic R, where Metal Knuckles was the unlockable character.