Sonic R/Reactive Factory

Collect all the coins on this course to unlock Metal Knuckles.

Coins

 * 1) At the start keep going forward down the "runway". The coin is on the submarine.
 * 2) Take the first right after the start line to find the coin.
 * 3) - Go along the track until the road splits into an upper road and a lower road. The lower one has the coin.
 * 4) - After you get the third coin continue until you reach a wide open area. Turn left.
 * 5) - Near the start/finish line is a 20 ring door. The coin is behind it.

Emeralds

 * 1) Just after the loop is a door. Go through it and the Emerald will appear just behind it. (Red)
 * 2) Turn left at the speed-up panel and go through the 50 ring door. The Emerald will appear on the yellow submarine. (Gray)