Instructions
Play the "Gears" game at the Clockwork Cantina on Main Street to get the multi-tool and store it in your backpack. Retrieve the steam battery from the trash can, then pull the level at the Cantina to activate a bridge to the Mayor's office. Use the multi-tool to get inside, look for a number on the note in the typewriter and exit.
Go through the lower entrance of the museum, jump on the platforms and climb the vines to get the dirty beaker. Go to Gear Alley to pick up the robot crab, then continue to Sully's store for Sprocket the robot and the rubber mallet.
Go right to travel to the Hub and use the robot crab to cool the metal hatch. Climb down, solve the "Tilt Mazes" puzzle and save Sprocket from the monster vines. Ride the elevators to the Captain's quarters and solve the puzzle with the number from the Mayor's office (0516). Go through the secret passage to obtain the mech weed wacker and bridge key from Captain Ziggs' skeleton.
Use the steam battery to solve a puzzle and lower the drawbridge to the Production Zone. Continue to the Factory to pick up the mech steam motor and climb the vine to enter the Greenhouse. Mix an herbicide with the dirty beaker, then kill the plant with it and enter the maintenance closet. Take the living quarters key, which sets off an alarm; smash the glass dome with the rubber mallet to escape.
Continue to Zach's room and solve the timed puzzle, then go outside and cross the vine tightrope to pick up the mech crank. Go to Sully's garage, repair the Mech with the steam motor and mech crank, then hop inside. Attach the weed wacker to kill plant monsters, then travel toward the hibernation center.
Hop out of the Mech and use your multi-tool on the machine in the hibernation center to learn what happened to the inhabitants of Steamworks Island. Pick up the "Toxic Blaster" and attach it to the Mech, then take the elevator through the Tunnel System to the second lowest floor, shooting plant monsters along the way.
Ride the moving platform and go through the door on the right to the final boss battle. Fight the three boss monsters by approaching to provoke an attack, then duck any incoming shots and shoot when the head pops out. Hit the last boss three times to kill him and complete Steamworks Island.