Point Prometheus

Fontaine smash! The bad guy's angry, or perhaps somewhat bemused at your effrontery, and is intent on giving you what you want: a fight. Well, he'll give it to you after you find him. It's a merry game of hide and seek!

Follow Fontaine until he breaks through a doorway and locks it behind him. You can't follow him unless you have a Little Sister open the door for you. How are you going to get them to trust you, though? Tanenbaum has a plan…

Become a Big Daddy

Search the body of the Big Daddy nearby (there's a Power to the People machine behind it) to find the Suit Control Device. Now that you have that, you can listen to Tanenbaum to learn more about what's required here. In order to effectively mimic a Big Daddy, you're going to have to look like one, smell like one, and sound like one. It's a big job, but someone'll have to do it.

Look Like a Big Daddy

There are three parts to the Big Daddy suit: the boots, the bodysuit, and the helmet. The Failsafe Armored Escorts facility on the south side of the area is where you want to go for these, or at least two of them. If you explore the area thoroughly, you shouldn't have any problem find the helmet (it's in the Candidate Induction room, but you'll be ambushed after picking it up, so be careful) and the bodysuit, in one of the larger central rooms. Explore the area as you wish after that.

The boots, as you'll discover if you read the diaries that you find, were delivered by accident to a library. The Mendel Family Library, to be exact: it's to the west of the entrance to the Failsafe facility, on the second floor of the area. Find it, enter, grab the boots, and you'll have the look down pat.

Sound Like a Big Daddy

You can find the voicebox modulator in Optimized Eugenics, on the northern side of the area. The modulator itself is in Live Subject Testing, on the southeastern side of Optimized Eugenics. Use it to change your sound, and don't miss the Alarm Expert 2 tonic on the bookshelves nearby.

You'll need to do a bit of voicework to change into a Big Daddy.

If you poke around here a bit, you'll find a diary of Suchong in the northeastern room, letting you know that the code to the ammo locker here is 1921. This probably refers to the ammo locker in Failsafe, which you probably already hacked into. Sorry! You can also find another Power to the People machine in the Eugenics Analysis room in the northwestern corner of the facility.

Lastly, there's a safe hidden near the generator. If you find the control room to the south of the generator room (you'll need to zap the locks), you can shut off the generator temporarily and reach the safe, which contains 100 bucks and some incendiary bolts, as well as a few EVE hypos on top of it.

Smell Like A Big Daddy

Lastly, you need to smell like a Big Daddy. That means pheromones. You can find them in the Little Wonders section on the eastern side of the area; head in via the second floor doorway to avoid the turrets on the first floor.

Don't piss off the Little Sisters.

You need three pheromone samples here, and they're spread out around the area. Two of them can be found on desks in the upper part of Little Wonders. There's also one sample in Room 5 on the ground floor, as well as Room 7 (which is only accessible by dropping down from the second level), as well as another one in the Autopsy Ward. You can also find Safecracker 2 in the Autopsy ward.

Pursue Fontaine

After you become a Big Daddy, return to the doorway that Fontaine escaped through and bang on the duct nearby with your wrench to summon a Little Sister. Time to bring the fight to Fontaine!