Tranquility Lane

 is a Fallout 3 quest, an Xbox 360/PC achievement and a PlayStation 3 trophy. The quest begins immediately after the completion of Scientific Pursuits, which ends when the player sits in a Tranquility Lounger in Vault 112 and begins the simulation that comprises Tranquility Lane.

Summary
Tranquility Lane is a virtual reality simulation housed in Vault 112, created by Doctor Stanislaus Braun. The player is tasked by one of the residents, Betty, with an ever-escalating series of violent jobs ranging from making a child cry to killing every resident in order to free the PC's father James from the simulation. As an alternative to completing the violent tasks, the player may activate the "Fail Safe" solution, which will free the residents from Betty's torment while granting good karma instead of bad. Both solutions result in the release of the player and his/her father from the simulation.

Betty's tasks
Betty will ask you to do the following things for her entertainment:

1.Make Timmy Cry: 2.Break Up The Rockwells' Marriage: 3.Kill Mrs. Henderson: Note that Betty is adamant that you cannot simply beat Mrs. Henderson to death, as that's boring; you must be creative about it. 4.Kill Everyone: As Betty says, you'll find the Pint-Sized Slasher gear in the doghouse to the right of the abandoned house. At this point, everyone will become hostile and attempt to flee from you (with the exceptions of Betty and the dog, Doc). Hunt down and kill everyone.
 * By attacking him physically.
 * By convincing him that his parents are divorcing each other because of him
 * By giving him the military school pamphlet to fool him into believing his parents are sending him away.
 * By killing one or both of his parents.
 * By telling Mrs. Rockwell that her husband is cheating on her, which she will believe after a speech check.
 * By placing the lacy underwear from the Simpson household on the desk in the basement, then telling Mrs. Rockwell that her husband is either cheating or he is a cross-dresser.
 * By reading Mrs. Rockwell's diary upstairs, which indicates that she'd like to kill Mrs. Simpson. Take the rolling pin from kitchen in the Rockwell house and beat Mrs. Simpson to death with it, then tell Mr. Rockwell about it. Note that reading the diary is optional; skipping that part will not prevent you from successfully completing the task in this manner.
 * The chandelier above the hallway to the kitchen can be rigged to drop when someone walks under it.
 * A roller skate can be moved to the stairs, resulting in Mrs. Henderson falling to her death when she tries to go upstairs.
 * Her oven can be sabotaged to leak natural gas. Ask her to make you a pie; when she lights the stove, the explosion will kill her instantly.
 * The security console in the kitchen can be accessed, allowing you to enable security lockdown, locking Mrs. Henderson in the house. Set her robot to "Begin Security Program" mode, and, as it wanders around, disable the "security parameters" data, rendering it unable to determine friend from foe. The robot will also be hostile to you. If you do manage to destroy the robot after it kills Mabel but before deactivating its security mode, you will not be locked in the house, just deactivate the security on the terminal and you can leave.

After everyone is murdered, Braun thanks you for the entertainment and tells you what you wanted to know most: Doc is actually your father, and has been watching you in horror the entire time. He then opens the exit door, allowing you to leave the simulation.

Fail safe summary
You can skip all of Betty's negative karma inducing tasks by finding the abandoned house at the beginning of the simulation. Step inside and activate the fail safe using the tones. You can also look at all the other notes written by Braun in here. After activating the fail safe, all the residents will be killed for good. You will receive positive karma, though, because you freed them from their otherwise eternal suffering at Braun's hands. Braun, as Betty, will be kept alive and forced to reside alone, forever. However, you can do all of the tasks for Betty and then activate the fail-safe. You will gain good karma and the citizens of Tranquility Lane will be revived and killed by the Chinese soldiers.

Fail safe details

 * 1) Old Lady Dithers will tell the player that she knows that Tranquility Lane is a simulation, that Betty is really "Braun", and that he uses a "Fail Safe Terminal". She mentions that the player should go to the Abandoned House, but mostly babbles.
 * 2) Within the abandoned house, the player will find a set of usual objects which make unusual noises when activated. If the player enters the proper sequence, the Fail-Safe Terminal will reveal itself. In the terminal, selecting "Chinese Invasion" will summon a number of Chinese soldiers who proceed to murder the residents of Tranquility Lane, with the exception of James (stuck inside Doc the dog), Betty, and the player. According to the notes on the Invasion program, this program disables the fail-safes on most of the pods, meaning that dying in the simulation will kill the real-world person as well.
 * 3) *The tone sequence is Radio (F), Pitcher (C), Gnome (D), Pitcher (C), Cinder Block (B), Gnome (D), Bottle (A).
 * 4) **If you can't remember the sequence to activate the terminal, note that each object has a specific tone, and Betty whistles the correct tonal sequence while playing in the center of the lane.
 * 5) **The solution melody is a cheeky reference to Tranquility Lane's soundtrack. The jolly theme is played multiple times by the marimba and once by the flute: F C D C B D A.
 * 6) If you speak to Braun, he will lament that he is now alone and trapped forever within the simulation, something confirmed by his own notes on the Chinese Invasion Plan on the Fail-Safe Terminal: the systems in place for his own safety will not allow him to be killed, even if the Invasion program is launched. He will further point out that Doc the dog is actually James, and he will be waiting for you once you leave the simulation.
 * 7) Using the Exit Door on the playground will end the simulation.

Outside Tranquility Lane
As soon as the Tranquility Lounger pod opens, James will run up to the player and begin a conversation. He had intended to find some holodisks, memos, or even experiments from Braun related to G.E.C.K, but what he found is a perfectly alive and insane Braun and got himself duped into Tranquility Lane as a dog. After some dialogue, he says he'll be returning to Rivet City to meet with Dr. Li and resume the project; the player can either immediately go with him or indicate that they've other tasks to attend to. This has no real influence on the plot, and James will leave for Rivet City regardless.

This immediately concludes Tranquility Lane and begins The Waters of Life.

Similar to the Anchorage Simulation, once you have left Tranquility Lane, you cannot return unless you load a save from before entering the simulation.

Karma

 * For positive Karma: Do not play any of Betty's games; instead activate the fail-safe. This will grant you a positive Karma bonus and allow you to exit.
 * For negative Karma: Complete all of Betty's tasks and finish by killing everyone as the Pint-Sized Slasher. Exit when Betty reveals the door.
 * For neutral Karma: Play all of Betty's games except for the last "Kill Everyone" task. After killing Mrs. Henderson and before asked to become the Pint-Sized Slasher, go into the Abandoned House, activate the fail-safe, and exit. This will balance both negative and positive karma effects from this quest.

Bugs

 * For some reason Mrs. Rockwell can skip the argument with her husband if you decide to use the lacy underwear. She will just run away when she's within speaking distance of her former husband. One way to avoid this is to exit the basement before she does and make sure Mr. Rockwell is not too close to the basement door.
 * There is a possibility that your follower will not return to their original location upon entering the simulation, and instead disappear.
 * If Mabel Henderson is not in her house, or leaves during the time you are arranging her creative death, she may not return. You may need to disable the security lockdown and find her, otherwise the only recourse is to load a previous save.
 * There is a possibility that you may lose a weapon upon exiting. This isn't an issue most of the time, but there is always a chance that a unique weapon could disappear, like the Wazer Wifle or the Experimental MIRV.
 * Upon completing the quest (perhaps only by using the failsafe) you get about 50 frag grenades (GOTY edition only?).

Fallout: New Vegas

 * Tranquility Lane has a cameo appearance in Fallout: New Vegas in the training simulation pod in the Hidden Valley bunker.

Behind the scenes

 * Game Informer rated Tranquility Lane as being among the ten most memorable moments in 2008 games.

Videos
Tranquility Lane Activate Chinese Invasion SimulationVideo:Tranquility Lane

Four part video of this quest:

Gallery
Трэнквилити-Лейн Tranquility Lane