Press and hold the Reload Button to have the Little Sister guide you back to Rapture Museum and down the stairs to the lower lobby. Follow the glowing trail of light to the specially-marked glowing corpse. Your adopted Little Sister knows this one has plenty of ADAM just waiting to be extracted!
Little Sister Encounter
Gather #1: Rapture Museum Downstairs Lobby
The majority of the Splicers that attack come down the stairs flanking the corpse. Set up Trap Rivets on the stairs and along the wall at the base of the steps. Place several more on the floor in front of the locked door adjacent to the corpse and fire another one at the fuel drum near the oil slick by the corpse. Make sure to hack the Health Station on the wall behind the vending machines if you haven’t already—injured Splicers that go to it get a nasty surprise. Stand near the corner and be ready to fire on the first Splicer to approach the Little Sister—the explosions and bullets won’t hurt her, so don’t worry! The final two Splicers to attack use a blowtorch to cut through the door next to the Little Sister. Stand back and smile as they step onto the Trap Rivets you’ve placed and are instantly killed.
Gather #2: Ride Cart Garage
Head through the door the final Splicers cut open in the Rapture Museum and follow the ride tracks up the ramp from the Journey to the Surface entrance. Proceed into the maintenance area behind the sign for the Censorship Bureau exhibit. Use the Hack Tool to hack the Turret in the distance. The corpse with the ADAM is right next to it. Set up Trap Rivets near the three openings leading into this area and also around the workbenches in the center. Make sure to hack the Health Station near where you enter the room and shoot out the windows overlooking the workshop (one less Rivet you’ll have to fire later on). Set the Little Sister down and use the Machine Gun to finish off any Splicers that make it past the Trap Rivets. Stay behind the Little Sister to keep the action in front of you (and the Turret to your right) and watch for Splicers to emerge from the entrance to your right. Fire a few rounds into the fuel drum near that hallway—it doesn’t just explode, it also ignites the fuel spill on the floor, too!
9-Irony
Exit the museum through the door the Splicers cut through with the blowtorch and step into the exhibit on the left containing Andrew Ryan sitting at his desk. Use Telekinesis to pick up the golf club in the rear corner of the exhibit and throw it at his head. Knock his head off with the club to unlock this sarcastic tribute to the founder of Rapture.
Prolific Hacker
If you’ve been hacking everything you could up to this point, then hacking the Turret in the Ride Cart Garage should unlock this bonus. If you haven’t, you’ll earn the title of Prolific Hacker as soon as you successfully hack a Security Camera, Security Bot, vending machine, Health Station, safe, and Turret.
Get to the Sister Vent
Your Little Sister has collected as much ADAM as she can hold, but you still do not have enough to purchase Incinerate! Sinclair said that you should take her to the workshop in the ride, where you can return the Little Sister safely. It seems like this is the only way to get the rest of the ADAM you need, so you should listen to him for now. Keep following the ride and look for the Puppet Workshop. It can be found on your left.