BioShock 2/Pauper's Drop

When you enter Pauper's Drop, Lamb will lock down the train to try and trap you. However, you can find a woman called Grace Holloway for the override key. The level is mostly straightforward, but you could miss some items.

Diner
There is a little siser wandering here. You can kill the protector and adopt her. The first body is in the north-west corner. When placed, splicers will attack from the two large approaches from the east and south, in addition to the small doorway from the north. If using trap rivets, you can easily plug the north entrance. The other two passages are simply long-range engagements.

While here, you can find the following:
 * Hacker's Delight (heals after hacking targets). Can be reached from the ramp on the east side of the center building. There is a turret before the bridge, which needs to be disabled or hacked. The tonic is behind the Meal-Time Frozen Dinners Ad.
 * Shotgun, found in the Fishbowl Diner, in the same place you see the code 0047 (for Fontane Clinics). Picking it up may trigger an ambush, where splicers jump through the ceiling.

Town Square
You will encounter a brute splicer here, being the first combat engagement. He is a strong fighter, who can throw items and knock you down with his melee attack.

The body in the middle of the square is a source of Adam. There's no special defensive position available, simply engage the splicers as they approach.

In the town square, you need to find the camera. It is found in the pawn shop, but the front door is locked. You will need to enter Fontane Clinics using the code 0047 (found in the Fishbowl Diner), and heading to the second floor. There's one splicer that tries kicking a burning barrel down the stairs, and there is also a camera and turret covering the route to the pawn shop.

When you have the camera, one splicer will arrive and wait just outside the shop. Equip the camera and start filming. To maximize research points, you should aim for a variety of attacks, especially in a complex combination (e.g. burn the enemy, then shock them when they run towards water.)

While here, look for:
 * Shorten Alarms, found in the Hamilton Apartments on a filing cabinet.
 * Fire Storm, found on the second floor, opposite the pharmacy, before the door to the rooftop walkway.
 * A Power to the People vending machine to upgrade your weapon. Found int eh Hamilton building on the second floor.

Skid Row
You need to research a Brute Splicer. There is found found near the Limbo Room, and you will likely get enough research points from the single combat to learn the Drill Dash ability.

The Limbo Room contains a Power to the People weapon upgrade.

Sinclair Apartments
Once you have Drill Dash, you can break through the barricade. There will be a few splicers waiting in the lobby, and are easily defeated.

Before leaving, remember to collect:
 * Power to the People, visible through a broken wall. The hallway leading to it is covered by a turret.
 * Freezing Drill, found on a table of sacrifices.
 * Keen Observer, found in the pink bedroom in Grace's Apartment.

Grace is found at the top of the apartment, and not too hard to reach her.

When you enter her apartment, he is hiding in a safe room. You will need to remove the poster hiding the secret switch, then press it. You may head to her safe room, and collect the key. There is a choice of killing her - if you decide to spare her, you will have two security bots escort you for the rest of the map, and a scene will slightly change later on. There's no signficiant benefit for killing her.

Once you have the override key (and gathered Adam from the little sisters), you can return to the Train. Use the override key to enable the train controls, and proceed to Siren Alley.