Umbral is a loosely objective-driven map. Since vanilla Garry’s Mod does not support formal objectives (objective texts, compass, POIs), this walkthrough is intended to guide you through the main routes and help you avoid getting stuck.

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Cross the snowfield to the digsite. You need to reach the tunnel on the opposite side. There are three ways:

Climb/stack objects.

Use the crane. Start the generator with the lever on the work cabin, then operate the cabin crane to swing the cargo into position as a platform.

Free the ladder. Break the ice holding it in place and climb up.


Descend the scaffolding to the exterior of the station. The main entrance is sealed under ice. Ignite the petrol spill covering it:

Shoot the spill.

Or drop a flare (found near the facility sign) onto it.


Much of the station is locked behind fire doors. You need power.

Go through the office area into the half-demolished bathroom.

Crawl through the breach, then left into the conference room.

In the projection room beyond, loot the corpse for a keycard.

Return to the corridor outside the conference room and unlock the door to Engineering.

Ignore the tunnel to the comms centre for now. Head straight, crouch under the jammed rolling door, and break the padlock on the chainlink gate. Press the button to open the hatch to the generator hall.

Drop down, then use the control to restart the backup generators.


Power must be re-enabled at the main control panel in the office. To get there, you'll have to head through the dormitories.

From the generator hall, climb the stairs into the storage rooms.

At the crossroads, turn right. Pass the broken elevator (it only works once a breaker is thrown topside).

Continue until you reach a ladder leading into the dorms.

At the top of the ladder, head right. In the corner bedroom, crawl through the vent to bypass the barricade.

Continue to the double doors and exit outside.

Head for the kennels. Slip behind the damaged fence and climb the rack to enter.

Inside, a keycard is held by a severed arm up in the rafters. Retrieve it by destroying the platform, stacking boxes, or jumping up.

Backtrack through the dorms to the common area. Use the keycard to open the locked door and re-enter the facility through the warehouse.

Head through the double doors directly ahead of you and take a right. Climb through the kitchen serving hatch and finally through the broken window leading back into the office corridor.

Once in the office, use the building control panel to raise fire doors and restore full power.




To get Ending A, you must trap the wight before extraction.

Return underground via the elevator or generator hall hatch.

At the crossroads, break the plank on the chainlink gate and descend.

Through the rolling door lies the long tunnel to the digsite.

Interacting with the H₂S valve lock panel or breaking the boards at the digsite will summon the wight. Once triggered, smash the boards and flee into the barrow. It will seal behind you.

Continue through the barrow, turbine hall, and steam tunnels until you re-emerge in the main tunnels.

If you unlocked the H₂S valves earlier, you can now open all four scattered through the tunnels. If not, return to the digsite and activate the panel.

If you're having trouble finding the valves, look out for the explosive gas warning signs. These are placed right next to the valves.



When all four valves are open, go to the monitoring station and disable emergency ventilation. This triggers an alarm—sprint back to the control room before the rolling door seals.

The door to the comms centre that you passed earlier on your way to engineering will now be unlocked. Head back to the door and open it with the button. Pass through the lab, server room, and corridors to reach the radio room and call for an extract using the radio.

Finally, use the flare launcher on the helipad to call for a chopper extract.


To get ending B1, you must call for extraction without first sealing the Wight underground.

Follow the same steps as for Ending A, but don't bother going back underground - instead head directly to the comms centre, call for the chopper, and use the flare launcher on the helipad.

After the chopper crashes, proceed back outside to the now partly destroyed hangar. Climb into the hangar and use the lever on the wall to open the rolling door to the snowcat.

Unfortunately, it's out of service. Go back through the hangar. As you emerge outside the main entrance, a gate to an underground passage will open in front of you.

Head underground and proceed down the elevator. Follow the caves and corridor until you reach the looping corridor.

Ending B1 is achieved by attempting to turn back from the looping corridor at any time before or after loop number 13.


Follow the same instructions as for Ending B1. Instead of attempting to turn back, instead keep going - for a long, long time.

When you reach 100 loops, you'll unlock ending B2.


As with ending B1 & B2, call the chopper without dealing with the Wight. Head to the loop corridor, but turn back and try to return exactly on loop 13.


Call the helicopter without sealing the Wight underground. After the crash, head down to the lobby area outside the office where you flipped the power back on.

Smash the glass front of the display cabinet and grab the baby doll.

Proceed through the broken hangar and present the baby to the snowcat - he'll know what to do.


At any time after restoring the power, take the baby doll from the display cabinet as described in Ending C.

Take it down to the tunnels and carry it through to Wight's barrow. Place it on the burial slab.

May god have mercy on your soul.

The achievement ID can be used in conjunction with the umbral_ach_grant <id> command to grant yourself an achievement.

Example:
umbral_ach_grant ach_inf

!togglesandbox – Switch between Story and Sandbox modes.