You arrive in Tranquility Lane, which is an alternate reality simulation provided by Vault Tek. As it is a simulation, you do not have access to inventory items,
Soon after you enter the simulation, you are informed by a resident to play with Betty in the park. She is by herself and wants you to participate in a few games.
Note: You do not have access to your items or VATS. In addition, you cannot return to this location once you exit.
Note: Playing her game, even though it seems to be the only option, causes you to lose karma.
Stand aside, comrade, while we deal with these Imperialist dogs.—Chinese commando
An old woman walking around the lane will tell you that this place is a simulation, and will tell you that a failsafe terminal is located within the abandoned building; this building has the Speed Limit 25 sign in front of it and is located to the right of the lemonade stand. The first room has various objects.
To unlock the terminal within this building, you need to decode a combination. When you activate one of the items, you will hear a small tone; if the item was incorrect, it is followed by a buzzing sound.
The combination can be obtained either through brute force or from Betty by listening to her occasional whistle, and matches the Radio, Pitcher, Gnome, Pitcher, Cinder, Gnome and Bottle.
Once you unlock the terminal, you can activate the Chinese invasion to open the exit.
The vault as various supplies around. To get access to the armory, you need a Science skill of 75. It contains a few additional medical supplies, along with ammunition, and the password to the overseer's office.
The overseer's office doesn't contain anything of interest, aside from a few miscallenous items.