Complete Guide to Levels 13, 14 and 15 of Bioshock for the PC

As the Bathysphere stops you’ll see Fontaine. Head through the next couple of rooms and you’ll see him again as he activates some security bots.

When the door opens, hack or destroy them and chase Fontaine into the main hall where he will escape through a door on the right. You now have to pretend to be a Big Daddy so a Little Sister will open the door for you. Follow Tenenbaum’s instructions. You’ll find a Suit Control System on a Big Daddy corpse here, head right and go through either door, kill the splicers and security bots then go through the door marked Little Wonders

There are two machine gun turrets through the windows to your right as you enter, deal with them and then climb through the window and through the next door. There’s a circular hall, grab pick ups from the rooms watching out for the odd splicer. In a room off to the right there’s a security camera and then the Safecracker 2 tonic and at the back of the room the Big Daddy Pheromone Sample, once you find them kill the Big Daddy who is patrolling around. Go back to the circular hall and follow it round to the stairs which will take you to the balcony.

As you come round to the left, you’ll find another Big Daddy Pheromone Sample. Pick up an audio log next to it on the third desk. As you proceed, you'll find another sample. Now, you have the three you need.

Head back to the main hall and go through the door on the right of the Circus of Values machine. There is a security camera immediately inside. Hack or disable it and proceed left to hack a rocket turret. Take the door that says Optimized Eugenics.

There is a camera straight ahead and a Big Daddy wandering around. Take them both out.

Go into the room on the right labelled Live Subject Testing. Go up the stairs and through the door on your right.

Grab the Alarm Expert 2 tonic and use the Voice Modification Machine. As you leave the room, watch out for three Splicers playing dead. There are a few other rooms you can explore for extra pick ups but none are required, each room has turrets. When you are ready, follow the arrow to the door marked Failsafe Armored Escorts and take either entrance.

Hack the sentry bots on the floor and go down the hall and through the door that says Candidate Conversion. There’s a machine gun turret off to the left and a rocket turret to the right.

When they’re dealt with, go to the back of the room to find an audio log which will tell you about the boots. Go through the next door, past the oil slick, over the railing and up the stairs to find the Big Daddy body suits.

Grab one and go through the door marked Candidate Induction. You can grab a helmet in here, watch out for spider splicers though, you can use the water on the floor to electrocute them. Exit the room, turn right and go to the main hall then take the door marked Mendel Memorial Library.

There is a security camera to your right as you enter and a machine gun turret in the hallway to the left of the camera. Head into the next room and grab the boots and the Damage Research 2 tonic, watch out for more spider splicers in here. Once it is clear exit and turn left down the stairs. You now look, smell and sound like a Big Daddy, hit the vent at the bottom of the stairs with your wrench and a Little Sister will come out, follow her as she opens the door for you and go through.