Map

Sewers

Last checked 2026-11-03

The sewers are not a second basement. You enter them from the basement storage room. The reason the floor has its own page is the Furnace, an optional superboss the wiki places at X=3, Y=2.

Look Outside battle screen showing Sam using a Molotov against a many-eyed creature — Screenshot: Look Outside (Francis Coulombe / Devolver Digital)

Rooms, access and connections

Source coverage: 1 independent source, Miraheze Sewers; checked 3 November 2026. Empty cells mean the referenced table does not supply that field.

Field	Publicly documented detail	Status
Access	Entered from the Basement Storage room	1 source
Rooms	Flooded rooms on a 0–7 × 0–3 grid; Boiler Room, David's Lair, Furnace room, Boiler Beast room, Tickle's raised section	1 source
Keys	No key; metal bars are opened by the eastmost lever, which frees the Boiler Beast	1 source
Discs	No discs; Furnace drops an Iris Key	1 source
Npcs	Tickle, David, David's students (Coralie, Thomas, Alice, Zachary, etc.), Steve	1 source
Bosses	Boiler Beast, Furnace, Sewer Beast	1 source
Puzzles	Eight fuel lines/ticks to awaken the Furnace; lever frees the Boiler Beast; waterfall shortcuts	1 source
Connections	Basement Storage, Garage, Boiler Room, Fungal Lair	1 source

Route schematic

Basement storage → Sewers → fuel-line Ticks → optional Furnace encounter

Original navigation schematic based on the cited area notes; arrows show progression, not measured room coordinates.

One entrance, one superboss

Storage first, sewers second. If the storage disc doors are still shut, you are not in the sewers yet. Those doors are 5 and 16, and they are documented on the basement page. I will not repeat the landlord’s rent math here except to say the basement key is what makes this path exist.

The Furnace row I will print is 1600 HP and 60 attack. No level is published. No elemental weakness is published. The reward players care about is the Furnace Edge: a weapon that, on its second break, becomes the Slagblade and cannot be taped back together. That transformation is on the weapons page. The fight’s existence is the sewer fact.

I do not have a second source for the tile coordinates. The wiki is one source, so the status on X=3, Y=2 is “1 source,” not a surveyed map. GameFAQs has floor maps by Cyrus917 for other levels. I am not going to pretend a sewer grid from a different floor’s image applies here.

Cursed mode’s basement rules (Antoine at the threshold) can stop you before this water ever appears. That gate is a difficulty rule, not a sewer puzzle. Drowning, which players also search beside “sewers,” is a different boss in apartment 28. Beating Drowning makes the party immune to drowning. It is not the Furnace, and it is not required to read this page.

Look Outside battle screen showing Sam firing four pistol shots at three creatures — Screenshot: Look Outside (Francis Coulombe / Devolver Digital)

Questions

How do you enter the sewers?

From the basement storage room.

Is the Furnace required?

No. The wiki lists it as an optional superboss.

Sources

Miraheze — Furnace checked 2026-11-03
Miraheze — Basement checked 2026-11-03