Reactive Factory is the fourth level made available for play in Sonic R. This is a factory complex built on a small island in the sea by Dr. Robotnik. It is completely automated, and uses water as fuel to operate. Among the many engines is a machine that will give you rings at no cost, making it easier for you to amass enough rings to unlock the goodies to be found on the track. This course's theme is Work it Out.
This course contains two Chaos Emeralds and collecting all five Sonic Tokens (and finishing in the top three) will allow you to race against and unlock Metal Knuckles.
||Here you are transported into the future! Enter the factory of tomorrow, a completely automated wonder. There is lots of room to run, but there are also many hidden surprises and traps. What appears to be at first a simple course is really the hardest of the four courses.