HalluciGen, Inc.

HalluciGen Inc. is a location in the Commonwealth in Fallout 4.

Layout
When you first encounter the facility, there has been a chemical leak and all the NPCs are attacking one another. Towards the end there is a decontamination chamber that cures radiation poisoning.

The layout of the building can lead to some confusion in determining which level you are on due to the significant amount of collapsed floors in the building. It would appear that the reception area after entering the main front door opens onto the second floor.

To access the third floor you may need to walk into a wall painting blocking the doorway to the staircase leading to it to nudge it out of the way. Further, two inactive protectrons may block your way into the first room on the third floor requiring their destruction.

The special grenade, HalluciGen gas grenade can only be made in Chemistry Station with a vat instead of normal "L" shaped Chemistry station. It is made with:
 * Adhesive #3
 * Aluminum #2
 * HalluciGen gas canister #1
 * Spring #1

At some point you can ascend into a corridor with several doors, which are opened by buttons. There are gunners fighting behind each of them. Instead of opening the doors and simply killing them, you may jump to the balcony with a staircase. Upstairs there's a room which will greet you with an announcement and invite you to test some products. Pressing the buttons in this room will emit poisonous gases to the rooms downstairs, where the gunners are. A terminal in this room reveals that the rooms below were actually used to demonstrate the products to VIPs, after which the rooms should be 'cleared of test subjects, blood, fluids'.

Notable loot

 * Tesla Science Magazine - Entrance level, northeast corner of the building, after ascending via a collapsed section of roofing.
 * Fusion core - Second level, in the room where you first see the Gunner Conscript, between an upturned filing cabinet and desk on the floor.
 * HalluciGen gas canister - Several locations in the basement. Needed for a minor quest given by a drug dealer in Goodneighbor.
 * HalluciGen mission brief - On the Gunner Commander.
 * Help wanted - On the entrance reception desk.
 * Minigun - In the basement room just west of the decontamination corridor and associated control room.
 * Note from Eric - On a desk beside a terminal.
 * Nuka Cola Quantum - In the same room as the Gunner Commander (southeast basement).
 * Stealth Boy - In an open safe in the same room as the Gunner Commander (southeast basement).
 * Mini nuke - on the floor in a room near the Tesla Science Magazine.

Appearances
HalluciGen Inc. only appears in Fallout 4.