Extra Little Sister Bug

In the Neptune's Bounty and Fort Frolic levels of BioShock and in Dionysus Park of BioShock 2 there are supposed to be three Little Sisters, in Arcadia there are supposed to be two, and in Farmer's Market there is supposed to be one. However, in certain circumstances, players can be presented with another Little Sister after dealing with the others. When attempting to exit these levels, these players will be presented with a message informing them that they have not dealt with all the Little Sisters if they dealt with the extra one.

Cause of the Bug

The extra Little Sisters bug is the result of scripted events that trigger a Little Sister and Big Daddy pair for a specific scene – typically a fight with Splicers. The triggers are usually as simple as entering a particular area (i.e. in Neptune's Bounty, it's the Upper Wharf; in Frolic, it's the Atrium after visiting the Plaza the first time; in Arcadia, it's a Gatherer's Garden.) If the player avoids these trigger points until all Little Sisters have been dealt with, then entering the trigger area will spawn an extra Little Sister.

In other levels with these scripted events, it is impossible to avoid the trigger, because the player is required to pass through that particular area in order to advance the game. For example, in Hephaestus there is a Big Daddy defending a Little Sister at the entrance to the Core area the first time the player passes through, but since that is the only way into the facility, it is impossible to avoid triggering the event.

BioShock

Main article: BioShock

Neptune's Bounty

When the first Rosie is encountered in the dock area he will retrieve a Little Sister from the hallway before the dock and they start gathering ADAM from a corpse in a muddy area in the middle of the Lower Wharf. DO NOT attack the Rosie until the scripted fight between it and a Nitro Splicer on the balcony starts (it happens as the Rosie walks across the muddy area). After this scripted fight you can kill the Rosie and gather ADAM from the Little Sister. Eventually, another Rosie will spawn and get another Little Sister from the vent in the Lower Wharf. After dealing with her, wait for THIRD Rosie in the same area and repeat extraction.

Dealing with these three Big Daddies can be especially difficult on higher difficulties or with the Vita-Chamber disabled due to the limited resources available at your disposal this early in the game and in this portion of the level. One method to make things easier is to lure them to the metro station and stand on top of the schedule bulletin for cover while you shoot at him in the doorway. Fair warning, he may try to get behind you if you do this and "climb" over the boxes and pallets to the right. Be sure to have plenty of armor piercing ammo and electric buck shot.

The extra Little Sister does not spawn as long as the player does not cross the muddy area in the Lower Wharf, and does not head upstairs from past the Gatherer's Garden near the Smugglers' Hideout. This means that it's possible to talk to Peach and/or grab the Teddy Bear for some extra firepower to help deal with the Big Daddies. Head to the Upper Wharf after the three regular little sisters have been dealt with, and witness another scripted fight between a Leadhead Splicer and a Rosie, kill the Rosie and gather the FOURTH Little Sister. After she is harvested or rescued, a fourth Little Sister symbol should appear in the pause menu.

If Vita-Chambers are active for the playthrough, save the game before fighting the last Big Daddy, since if the player is killed, the extra Little Sister may have time to "go home" permanently.

Xbox 360 & PS3 "Greatest Hits"

In the PS3 "Greatest Hits" version of the game, the Little Sister (and her Rosie) in the Upper Wharf of Neptune's Bounty will respawn in the same area. First, kill the Rosie and deal with the Little Sister, then head back to the corridor between Jet-Postal and The Fighting McDonagh's Tavern. As the player heads back toward the passage up to the Wharfmaster's quarters, a respawned Little Sister and her Rosie will appear. The player may need to go up to the Wharfmaster's Office area for this to occur, but do not get the camera until the extra Little Sister has been found.

Arcadia

There are normally two Little Sisters in Arcadia, but if players avoid the scripted fight between a Splicer and Big Daddy at the Gatherer's Garden outside the Grotto area, then a third can be found. If the player hears a Big Daddy fighting Splicers when passing around this area before dealing with the two Little Sisters, it means that the event has already been triggered and it will be necessary to restart from a previous save to try again.

To trigger an extra Little Sister, go directly from the Tea Gardens to the Lower Concourse, avoiding the Gatherer's Garden in the upper area. Staying in the canal, travel all the way through to the Storage Room, then up the stairs to the Upper Rolling Hills where there should be a Big Daddy and a Little Sister. The key to getting this to work correctly is to crouch down as you maneuver through the canal. Otherwise, you may trigger the scripted event on the way to the Storage Room. While traversing through the canal, take note of a Houdini Splicer nearing the end of the canal. The player will notice him with triggered splashes that can be visible in the water. It is recommended to stick to the right side of the canal while moving slowly while remaining crouched to remain undetected. Fighting this Splicer while in the canal can tempt the player to stand, which may trigger the event in Garden. Go to the Upper Rolling Hills. On the way, you will encounter an RPG turret. Deal with it, then continue past the turret downstairs and the player should run into the first Big Daddy on the way. Wait until he grabs a Little Sister, then kill him to deal with the first Little Sister.

At this point, Big Daddies have been activated across the entire map and the closest Big Daddy spawn point is near by the health station you just passed. Unfortunately, it is also near the Gatherer's Garden with the scripted Big Daddy and Little Sister. So turn and move back and forth through the canal (don't forget to crouch) and the Upper Rolling Hills until you hear a new Big Daddy. Give him a few minutes to lumber off, and when he returns he will have a Little Sister in tow. Deal with them as you see fit and then head to the Gatherer's Garden to start the scripted fight with the Extra Little Sister.

Alternatively:

After the first Big Daddy has been defeated and the Little Sister has been dealt with, trigger Andrew Ryan's radio message and release of the poison and go to Langford's lab, which will prompt the opening of the Tree Farm.

Go find the rose Langford wants. However, do not enter through the area containing the rose using the door across the Garden, as this may trigger the event. You will see - through the other doorway - several Splicers beating a burnt Houdini Splicer. Go through that doorway, get the rose, and leave the way you came in (NOTE: It is highly recommended that the player make back-up saves. Then test to see if the event triggers. If nothing happens in the Garden, then the event has already happened, which will require the player to load a second previous save. Otherwise, if the event has been triggered reload the last save. This is basically to test that the event hasn't been triggered.) Return the Rose to Langford and keep playing until the player receives the next goal to create the Vector. On the way out of the office the player should find a Big Daddy in the area leading up to the office. Kill him and deal with the second Little Sister.

After the first two Little Sisters have been dealt with, head towards the Gatherer's Garden machine. The Gatherer's Garden can be approached from the Tree Farm entrance or from the Tea Garden.

Farmer's Market

It is possible to access an extra Little Sister in Farmer's Market, although it is perhaps the most difficult one to reach and almost certainly the most time-consuming. It requires moving boxes, barrels, or other things to stand on in order to jump onto a ceiling beam. From the beginning, enter the market and turn left. There should be a health station right before a doorway that is under a torn red banner. If one goes through the doorway, they can look up to see a thick wooden beam. Walking under this beam triggers a scripted event in which a Houdini Splicer battles a Rosie guarding a Little Sister. As there is no way to spawn other Sisters on the map without walking past this doorway, one has to walk over the beam to prevent the scripted event from happening.

There are plenty of barrels and crates to pile up, but the difficulty lies in stacking them neatly on top of one another. Upon reaching the beam, jump to the beam to the right of the sagging green-white tapestry, and then jump down. This should prevent the scripted event from happening.

One does not have to jump over the beam to avoid triggering the event. Simply stack high enough to jump onto the green and white tapestry. It is recommended to do this where the tapestry is at its lowest. Then simply head off the opposite side to avoid triggering the event (http://i.imgur.com/XFHLqfR.jpg).

One can also use a physics glitch by acquiring the wooden chair (no other chairs will do) found in front of a U-Invent in the northwest room of the lower Market area. While standing on the chair, use of telekinesis on the chair launches the player into the air and with some trial and error maneuvering over the beam is possible. Release the chair to land safely. It isn't easy to control the direction and it is possible to die this way, but it is much less time consuming to bypass the trigger.

After moving past the beam and dropping down, proceed through the level as normal. A Big Daddy can be found in the distillery. After he retrieves a Little Sister and the pair are dealt with, head back to the scripted event for the extra Little Sister.

Fort Frolic

To find an extra Little Sister in Fort Frolic, avoid killing any of Cohen's targets in Poseidon Plaza before the three Little Sisters have been dealt with in that area.

Head to Poseidon Plaza after it becomes accessible. Deal with all three Little Sisters within Poseidon Plaza, waiting for each Big Daddy to spawn after the last has been killed. When ready for the extra (fourth and last) Little Sister, kill Finnegan and head back to Sander Cohen's Masterpiece to find her. Her spawning is triggered by starting the Martin Finnegan fight and is indicated by a fight between her Big Daddy and several Spider Splicers.

Note: If the player finishes exploring all of Poseidon Plaza once having dealt with three Little Sisters there before returning to the Atrium (i.e. fully investigating all rooms including the basement and [more importantly] completing all objectives in the area for Cohen), the triggered Big Daddy fight near the Masterpiece will be skipped and the extra Little Sister can not be found without reloading a save that meets these criteria.

Effect on Gifts and the Ending

The player receives gifts from Brigid Tenenbaum for every three Little Sisters that are rescued – seven gifts total and maximum – and extra Little Sisters count towards this number. Therefore, it is possible to get Tenenbaum's gifts early by saving extra Little Sisters. However, there is no extra eighth gift or message from Tenenbaum if 24 sisters have been rescued.

The ending cinematic the player receives after defeating Fontaine depends on the number of Little Sisters the player has saved or harvested. There are normally 21 Little Sisters in the entire game, but by successfully exploiting the bug in each of the respective levels, there can be 25. If the player has found any extra Little Sisters, one (and only one) Little Sister may be harvested without the game counting it toward the bad ending.

BioShock 2

Main article: BioShock 2

Dionysus Park

Extra Little Sister - Dionysus Park

After talking to Stanley Poole make sure to avoid the theater. Head towards the J. Fischer Gallery, located past the frozen entrance of Imago Fine Arts. In the gallery, kill the Big Daddy and pick up your first Little Sister. Have her harvest the ADAM corpses nearby, then send her to the vent and rescue/harvest her. Once you're done head back towards the piano area where you'd find the locked door that opens to the Chase Carousel. After the splicers opens it, kill all of them and head towards the door near the Gatherer's Garden machine.

Save your game before you enter this area.

Enter the area and turn right, before you go pass this door, prepare your weapons, one without splash damage, as soon as you enter kill all the splicers and make sure that both of the Big Daddies remain alive. If only one survives, reload the game until you do. Let the other Big Daddy walk off to the vent (it could in the same room or the vent outside) and let him summon a Little Sister. You can kill the other one who already has a Little Sister but make sure the other lives until he summons his own sister. Once there are two little sisters around, kill them both. At this stage you will have Little Sister 2 and Little Sister 3. Pick one of them up and have her harvest the ADAM corpses then return her to the vent.

As soon as you pick up the third Little Sister, don't harvest any corpses yet, instead head all the way back to Dionysus Park's entrance. You should find your fourth Little Sister there. You can kill the Bouncer accompanying her and leave her there while you take your third sister to harvest the corpses. Once the third is handled, head back to the fourth and have her harvest ADAM then send her back to the vent to rescue or harvest.

Notes:

• You can gather from two corpses with each Little Sister. On a normal playthrough you will gather six corpses, leading to 600 ADAM (60 for each corpse, 80 for each Little Sister rescued), but with this method - and with all corpses gathered - you get +200 ADAM.
• There's a bug that if you pick up your fourth sister she may disappear as soon as you reach the second floor near Cohen's Gallery (the same area where you hear Mark Meltzer yelling at the Big Sister.) This bug only appears if the ADAM corpses in Cohen's Gallery and the one in the Basement Storage have not been harvested by any of the three earlier Little Sisters. To ensure she does not vanish, make sure both of the corpses have been harvested before picking up the fourth Little Sister. If one of these corpses remain untouched the fourth sister will disappear as well.
• For the PC, if the player used noclip to harvest/rescue the Little Sister during Delta's first underwater walk, the fourth sister will not appear unless player enters "setBigSisterResentment 0" into the command console at the very beginning of the Dionysus Park level. By entering this command the Big Sister will only appear after the third sister has been dealt with instead of the second.
• If you rescue/harvest the last Little Sister, wait for Eleanor's message before making any other interaction.
• Make sure to not be carrying a Little Sister when the Big Sister attacks or she will disappear.

Effect on the Ending

Unlike Bioshock, the extra Little Sisters found and treated in the game's playthrough still counts towards the ending. If the player finds the extra little sister in Dionysus Park, how the player chooses to treat the last Little Sister in Fontaine Futuristics will still affect the ending. A player cannot choose a Rescue playthrough for the first 12 Little Sisters, then choose to harvest the 13th (and vice versa) - the ending will automatically turn towards the Choice Endings if said choice is made.

Behind the Scenes

• In Olympus Heights, in the entrance to Mercury Suites in front of the elevator to Fontaine's apartment is a scripted fight between a Big Daddy/Little Sister pair and a Leadhead Splicer. This particular event is unique and the glitch is not exploitable on it: dealing with all Little Sisters before encountering the event simply causes it to not play.