HALLOWED REACTOR: what changed in 1.3.95

The October 31 release expanded Reactor 4 with a new area, infected type and special mission. Three random post-game events now have their own minimap markers. Sector 3 is fully mapped on the minimap, with missing main-objective markers added and misplaced cache markers corrected.

Night vision does not work in the basement no-signal zone. The patch makes NVGs shut down there and prevents reactivation while inside. Bring a light source and follow the current objective display; the September videos below predate this expansion.

Miraheze's October 31 Reactor 4 revision describes an Infested Basement near the Flesh Prison, with an entrance blocked by Barnacles and both radar and night vision disabled inside. This is community documentation, not a route we have tested; it does not establish that the side area's mission is required for the ordinary valve objective.

1.3.96 follow-up: the developers fixed players running through Barnacles and minimap icons moving along with the player. Treat the Barnacles at the entrance as an obstacle, rather than relying on the old collision bug. The patch also moved Carlos and Rodrigo within the lobby, without giving their new coordinates.

The developers' 21-day notice sets the limited-time event content's end at November 20, 19:00 UTC / November 21, 03:00 Taipei. The Roblox event listing's November 30 end is not the stated gameplay deadline. The notice does not identify which permanent changes, if any, will be reverted.

The main facility at a glance

This diagram shows progression landmarks, not corridor geometry or distances. Complete the active objectives before moving to the next gate.

  1. STARTLobby & entrancePrepare your run
  2. SECTOR 1Generators & Reactor 4Complete the opening objectives
  3. SECTOR 2Control room & LogisticsKeycard and laptop access
  4. CHECKPOINTSector 3 entranceVerify your badge conditions

Objective schematic only. The dated walkthrough below shows the September layout and predates the HALLOWED REACTOR expansion.

Sector 1 and Reactor 4

The community location guide identifies Generator 1 as the first objective and Generator 2 as the third. The Reactor 4 sequence includes its backup generator and Basement valve. Treat those as separate interactions: finding a generator room does not mean all access conditions are complete.

Reactor 4 was reworked on September 18. Fandom marks its older Basement section as outdated. The October 31 expansion changed it again. Follow the current objective display; KOTLK's September 18 footage is a dated reference and does not cover the new area or mission.

0:52
First objectiveStart the opening sequence.
2:30
Third objective locationThe creator visits this before the second-objective route.
4:40
Second objective locationContinue into the Reactor 4 sequence.
7:50
BasementThe exit route begins at 8:20.

The official NUMBER_FOUR_REACTOR badge is tied to releasing the Basement valve. Before returning to the Sector 2 gate, check that the required generator and valve objectives actually registered.

What is inside Reactor 4

Miraheze added a Reactor 4 location page on October 12, after the rework. It describes these hazards; we haven't walked them ourselves.

  • Doors: the entrance gate near the Sector 2 gate starts open, but the doors into the reactor stay blocked until Generator 1 is on.
  • Grabbies: four wait on the upper layer. Get close to one and you have to pass a quick-time event to survive.
  • Contaminated hallway: the irradiated corridor toward the backup generator deals damage every tick while you stay in it, building up to 1.5 per tick.
  • Elephant's Foot: the molten mass in the middle of the Basement's Flow Control Room, where the valve is. Facing it drags your camera toward it, and looking straight at it kills you in about three seconds.
  • Flesh Prison: a Leaper sits behind a wall of flesh and stays inactive until someone burns the flesh with an SHC-23. Killing it earns UNRECOGNIZABLE by Miraheze's account.
  • Catwalk room: slipping through the gap between the floor and the catwalk awards TRIP_HAZARD.

Miraheze's main-area table counts 8 Mutants, 3 Crawlers, 4 Grabbies and one Leaper; it lists the Infested Basement separately. These are not totals for the expanded reactor. The November 2 Locations revision also adds Barnacles to its Reactor 4 list, consistent with the separate Infested Basement description. The October 17 Fandom Crawler page instead counts 2 Crawlers; we have not verified either total in-game.

Open the route through Sector 2

After the opening objectives, find the Sector 2 gate and use its entrance button. The community location pages describe the following access chain inside Sector 2:

  1. Control-room access: interact with the laptop on the floor in the far room off the left-hand route.
  2. Logistics access: use the Sector-2 Logistics Shutters control. The emergency-door shutter control opens a different route.
  3. Gate Control access: collect the blue keycard in the Gate-1 area of Logistics, then use the reader at the upstairs door.
  4. Sector 3 access: interact with the Gate Control laptop and finish the active laptop/data objectives.
  5. Reach the blast gate: return toward the Sector 3 approach, open the gate with its button and enter the hallway.

These are community-documented landmarks. Match the room signs and active task text to your current server; the September walkthrough's Sector 2 section starts at 9:40.

For Underequipped, the official finish is the Sector 3 entrance. The remaining Sector 3 combat and supply-cache objectives are beyond that badge's stated finish.

Sector 3 also holds the weapon crates that drop the four contraband guns. Drop odds, badges and the OVEREQUIPPED set are in the weapon crates guide.

Legacy facility map

This community drawing is useful for recognizing the relative sector layout and the map's symbols. Its source labels it outdated; it predates the September Reactor 4 rework and should not be used as a current room-by-room route.

Legacy Examination community map: Sector 1 and 2 at the bottom, Sector 3 above, with generator, laptop, valve and keycard symbols. Reactor 4 layout is outdated.
HISTORICAL REFERENCE · NOT CURRENT GEOMETRYOpen full size ↗

Original layout: DontMindMe. Rework, icons and redesign credited on the image to KOTLK, Icons, Balaclavas and Pluto. Reproduced unchanged from the community file page; artwork remains with its creators.

Know which route you are entering

Tunnels

The Utility door in the lobby and the black cross in the showers lead to a separate mode. Its two layers, colored keycards and coolant objectives are covered in the Tunnels map and walkthrough. Walking into this mode does not continue a Sector 3 badge run.

Yuri’s simulation

After obtaining entry permission, the showers-area teleporter above the Regalia display leads to Yuri's challenge. It uses an altered facility layout and a kill-count objective. Do not confuse that teleporter with the Tunnels cross.

Manhattan’s collections

Her three tasks move through Sector 2, Sector 3 and then the Basement. That final return is intentional; the quest is not a simple march toward the last sector.

Sources & verification

The route was checked September 23, 2026; the 1.3.95 patch and Miraheze Reactor 4 revision 7644 were read on November 1. Patch 1.3.96 and Locations revision 7732 were checked November 3. The older enemy-count comparison is retained as dated community documentation. The schematic is our rendering of the documented progression, not a surveyed map. No independent in-game navigation test was performed.

Underequipped badge route ↗Add solo, private-server and classless eligibility to this route.Reworked Tunnels guide ↗Keycards, pump rooms, coolant loop and the escape.Manhattan’s collection route ↗Sector 2 crystal, Sector 3 blueprint, then Basement crystal.