|Points of interest|
Fort Sprocket was an industrial planet in the Solana galaxy. It is the home of the Bolt Foundry, where all of the galaxy's bolts were made. It was taken over by the Kingpin and the usual guards were replaced with his Doppelgangers. Apart from the Doppelgangers, Static Midges and other robots like the Bolt Thief were seen in the foundry.
On the second mine-cart, you have to go backwards to receive the keycard.